Adopt mise for development workflows

- Lock Python and uv versions with mise
- Add unified sync, app, test, lint, format, and typecheck tasks
- Update development documentation and strengthen type handling

AGENTS.md

@@ -17,18 +17,20 @@ is reachable in the current application.
 ## Commands
 
 ```bash
-uv sync
+mise install
-uv run hosts
+mise run sync
-uv run pytest
+mise run app
-uv run pytest tests/test_parser.py
+mise run test
-uv run ruff check .
+mise run test -- tests/test_parser.py
-uv run ruff format --check .
+mise run lint
-uv run ruff format .
+mise run format-check
+mise run typecheck
+mise run check
+mise run format
 ```
 
-Use `uv run pytest <path>` for the narrowest relevant test during development.
+Use `mise run test -- <path>` for the narrowest relevant test during
-Before handing off a change, run the full test suite, Ruff lint, and Ruff format
+development. Before handing off a change, run `mise run check`.
-check.
 
 ## Code boundaries
 

CONTRIBUTING.md

@@ -9,17 +9,18 @@ bugs or coordinate consequential changes.
 
 ## Development setup
 
-The project requires Python 3.13 or newer and
+The project uses [mise](https://mise.jdx.dev/) to install its locked Python and
-[uv](https://docs.astral.sh/uv/):
+uv versions and to provide its development tasks:
 
 ```bash
 git clone https://git.s1q.dev/phg/hosts.git
 cd hosts
-uv sync
+mise install
-uv run hosts
+mise run sync
+mise run app
 ```
 
-`uv run hosts` starts the real application and reads `/etc/hosts`. Stay in
+`mise run app` starts the real application and reads `/etc/hosts`. Stay in
 Read-only Mode unless you deliberately intend to exercise privileged behavior
 on your machine. Automated tests must use mocks and temporary files instead.
 
@@ -80,23 +81,21 @@ Treat any test capable of touching the real system file as a defect.
 Run the narrowest relevant test while developing. Examples:
 
 ```bash
-uv run pytest tests/test_parser.py
+mise run test -- tests/test_parser.py
-uv run pytest tests/test_manager.py
+mise run test -- tests/test_manager.py
-uv run pytest tests/test_main.py
+mise run test -- tests/test_main.py
 ```
 
 Before handing off any change, run the complete validation suite:
 
 ```bash
-uv run pytest
+mise run check
-uv run ruff check .
-uv run ruff format --check .
 ```
 
 Apply formatting with:
 
 ```bash
-uv run ruff format .
+mise run format
 ```
 
 Add or update tests for changed behavior. Test user-reachable workflows at the

README.md

@@ -93,10 +93,14 @@ Clone the repository for development:
 ```bash
 git clone https://git.s1q.dev/phg/hosts.git
 cd hosts
-uv sync
+mise install
-uv run hosts
+mise run sync
+mise run app
 ```
 
+[mise](https://mise.jdx.dev/) installs the locked Python and uv versions and
+provides the project's development tasks.
+
 See [CONTRIBUTING.md](CONTRIBUTING.md) for code boundaries, safety contracts,
 tests, linting, and documentation expectations. Domain language lives in
 [CONTEXT.md](CONTEXT.md), and consequential design decisions live in

mise.lock

@@ -0,0 +1,45 @@
+# @generated - this file is auto-generated by `mise lock` https://mise.jdx.dev/dev-tools/mise-lock.html
+
+lockfile_version = 1
+
+[[tools.python]]
+version = "3.13.15"
+backend = "core:python"
+specifiers = ["3.13"]
+
+[tools.python."platforms.linux-arm64"]
+checksum = "sha256:01ce0ce9189feaead3298abf10d4efe998c55a489b3d5d38ca4f83dda7e7977e"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260901/cpython-3.13.15+20260901-aarch64-unknown-linux-gnu-install_only_stripped.tar.gz"
+
+[tools.python."platforms.linux-x64"]
+checksum = "sha256:8a689a077337bea6d1c4bc0b7df1d52fcaa28f5f67e50df8bf417c1e3f9d8874"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260901/cpython-3.13.15+20260901-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz"
+
+[tools.python."platforms.macos-arm64"]
+checksum = "sha256:d3904bd6a072246e07aa0bdadee9a14e80521e42a943c0848059feb16a2816dc"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260901/cpython-3.13.15+20260901-aarch64-apple-darwin-install_only_stripped.tar.gz"
+
+[tools.python."platforms.macos-x64"]
+checksum = "sha256:f712a9143c8a5d248438ec7921a0b48d548bca4f1337d33c690d28c2d0504137"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260901/cpython-3.13.15+20260901-x86_64-apple-darwin-install_only_stripped.tar.gz"
+
+[[tools.uv]]
+version = "0.12.9"
+backend = "aqua:astral-sh/uv"
+specifiers = ["0.12"]
+
+[tools.uv."platforms.linux-arm64"]
+checksum = "sha256:7eb9bf48516448c9db6a9e436d8e747ac9c8a9cac74717160a29918249b080a6"
+url = "https://github.com/astral-sh/uv/releases/download/0.12.9/uv-aarch64-unknown-linux-musl.tar.gz"
+
+[tools.uv."platforms.linux-x64"]
+checksum = "sha256:aa4b1f8770910f7c7c543c7acc980e4270e52e70750c996acef813ea1c7c2912"
+url = "https://github.com/astral-sh/uv/releases/download/0.12.9/uv-x86_64-unknown-linux-musl.tar.gz"
+
+[tools.uv."platforms.macos-arm64"]
+checksum = "sha256:301f72afaf54060f92da7016cb0115bd077f43a9c8e39c1d8170a0bac80fd398"
+url = "https://github.com/astral-sh/uv/releases/download/0.12.9/uv-aarch64-apple-darwin.tar.gz"
+
+[tools.uv."platforms.macos-x64"]
+checksum = "sha256:e1ca175824f1056589ce9908f7631879ebc3c36535b5e63dc06510beb370b4c1"
+url = "https://github.com/astral-sh/uv/releases/download/0.12.9/uv-x86_64-apple-darwin.tar.gz"

mise.toml

@@ -0,0 +1,42 @@
+[tools]
+python = "3.13"
+uv = "0.12"
+
+[settings]
+lockfile = true
+
+[tool_config]
+locked = true
+
+[tasks.sync]
+description = "Synchronize project dependencies"
+run = "uv sync"
+
+[tasks.app]
+description = "Run the hosts application"
+run = "uv run hosts"
+
+[tasks.test]
+description = "Run the test suite"
+run = "uv run pytest"
+raw = true
+
+[tasks.lint]
+description = "Check code with Ruff"
+run = "uv run ruff check ."
+
+[tasks.format]
+description = "Format code with Ruff"
+run = "uv run ruff format ."
+
+[tasks.format-check]
+description = "Check formatting with Ruff"
+run = "uv run ruff format --check ."
+
+[tasks.typecheck]
+description = "Type-check the project with ty"
+run = "uv run ty check"
+
+[tasks.check]
+description = "Run the complete validation suite"
+depends = ["test", "lint", "format-check", "typecheck"]

pyproject.toml

@@ -6,9 +6,14 @@ readme = "README.md"
 requires-python = ">=3.13"
 dependencies = [
     "textual>=5.0.1",
+]
+
+[dependency-groups]
+dev = [
     "pytest>=8.4.1",
     "pytest-asyncio>=0.21.0",
     "ruff>=0.12.5",
+    "ty>=0.0.78",
 ]
 
 [project.scripts]

src/hosts/core/dns.py

@@ -15,7 +15,6 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-@dataclass
 class DNSResolutionStatus(Enum):
     """Status of DNS resolution for an entry."""
 
@@ -70,6 +69,8 @@ async def resolve_hostname(hostname: str, timeout: float = 5.0) -> DNSResolution
         if result:
             # Get first result (usually IPv4)
             ip_address = result[0][4][0]
+            if not isinstance(ip_address, str):
+                raise OSError("DNS resolver returned a non-IP address")
             return DNSResolution(
                 hostname=hostname,
                 resolved_ip=ip_address,
@@ -124,7 +125,7 @@ async def resolve_hostnames_batch(
     # Convert exceptions to failed resolutions
     resolutions = []
     for i, result in enumerate(results):
-        if isinstance(result, Exception):
+        if isinstance(result, BaseException):
             resolutions.append(
                 DNSResolution(
                     hostname=hostnames[i],

src/hosts/core/import_export.py

@@ -423,8 +423,9 @@ class ImportExportService:
 
                 # Validate required columns
                 required_columns = ["hostnames"]
+                fieldnames = reader.fieldnames or []
                 missing_columns = [
-                    col for col in required_columns if col not in reader.fieldnames
+                    col for col in required_columns if col not in fieldnames
                 ]
                 if missing_columns:
                     return ImportResult(

src/hosts/tui/add_entry_modal.py

@@ -14,7 +14,7 @@ from ..core.models import HostEntry
 from .styles import ADD_ENTRY_MODAL_CSS
 
 
-class AddEntryModal(ModalScreen):
+class AddEntryModal(ModalScreen[HostEntry | None]):
     """
     Modal screen for adding new host entries.
 
@@ -132,6 +132,7 @@ class AddEntryModal(ModalScreen):
 
                 # Reset checkbox to default (active) for IP entries
                 active_checkbox.value = True
+                if isinstance(active_section, Vertical):
                     active_section.border_title = "Activate Entry"
 
                 # Focus IP input
@@ -149,6 +150,7 @@ class AddEntryModal(ModalScreen):
 
                 # Set checkbox to inactive for DNS entries (will be activated after resolution)
                 active_checkbox.value = False
+                if isinstance(active_section, Vertical):
                     active_section.border_title = (
                         "Activate Entry (DNS entries activate after resolution)"
                     )
@@ -172,7 +174,7 @@ class AddEntryModal(ModalScreen):
         # Determine entry type
         radio_set = self.query_one("#entry-type-radio", RadioSet)
         is_dns_entry = (
-            radio_set.pressed_button
+            radio_set.pressed_button is not None
             and radio_set.pressed_button.id == "dns-entry-radio"
         )
 

src/hosts/tui/app.py

@@ -8,6 +8,7 @@ all the handlers and provides the primary user interface.
 from dataclasses import dataclass
 
 from textual.app import App, ComposeResult, SuspendNotSupported
+from textual.binding import Binding
 from textual.containers import Horizontal, Vertical
 from textual.widgets import (
     Header,
@@ -29,7 +30,6 @@ from ..core.filters import EntryFilter, FilterOptions
 from .config_modal import ConfigModal
 from .add_entry_modal import AddEntryModal
 from .delete_confirmation_modal import DeleteConfirmationModal
-from .filter_modal import FilterModal
 from .custom_footer import CustomFooter
 from .styles import HOSTS_MANAGER_CSS
 from .keybindings import HOSTS_MANAGER_BINDINGS
@@ -289,7 +289,7 @@ class HostsManagerApp(App):
             # Process keybindings and add to appropriate sections
             for binding in self.BINDINGS:
                 # Skip tuple-style bindings and only process Binding objects
-                if not hasattr(binding, "show"):
+                if not isinstance(binding, Binding):
                     continue
 
                 # Only show bindings marked with show=True
@@ -506,7 +506,7 @@ class HostsManagerApp(App):
     def action_config(self) -> None:
         """Show configuration modal."""
 
-        def handle_config_result(config_changed: bool) -> None:
+        def handle_config_result(config_changed: bool | None) -> None:
             if config_changed:
                 # Reload the table to apply new filtering
                 self.table_handler.populate_entries_table()
@@ -719,7 +719,7 @@ class HostsManagerApp(App):
             self.update_status("❌ Cannot delete system default entry")
             return
 
-        def handle_delete_confirmation(confirmed: bool) -> None:
+        def handle_delete_confirmation(confirmed: bool | None) -> None:
             if not confirmed:
                 self.update_status("Entry deletion cancelled")
                 return
@@ -750,7 +750,7 @@ class HostsManagerApp(App):
 
         self.push_screen(DeleteConfirmationModal(entry), handle_delete_confirmation)
 
-    def action_quit(self) -> None:
+    async def action_quit(self) -> None:
         """Quit the application."""
         self.navigation_handler.quit_application()
 
@@ -987,63 +987,6 @@ class HostsManagerApp(App):
         self.run_worker(update_single_dns(), exclusive=False)
         self.update_status(f"🔄 Resolving DNS for {entry.dns_name}...")
 
-    def action_show_filters(self) -> None:
-        """Show advanced filtering modal."""
-
-        def handle_filter_result(filter_options: FilterOptions) -> None:
-            if filter_options is None:
-                # User cancelled
-                self.update_status("Filtering cancelled")
-                return
-
-            # Apply the new filter options
-            self.current_filter_options = filter_options
-
-            # Update the search term from filter if it has one
-            if filter_options.search_term:
-                self.search_term = filter_options.search_term
-                # Update the search input to reflect the filter search term
-                try:
-                    search_input = self.query_one("#search-input", Input)
-                    search_input.value = filter_options.search_term
-                except Exception:
-                    pass  # Search input not ready
-            else:
-                # Clear search term if no search in filter
-                self.search_term = ""
-                try:
-                    search_input = self.query_one("#search-input", Input)
-                    search_input.value = ""
-                except Exception:
-                    pass
-
-            # Refresh the table with new filtering
-            self.table_handler.populate_entries_table()
-            self.details_handler.update_entry_details()
-
-            # Get filter statistics for status message
-            counts = self.entry_filter.count_filtered_entries(
-                self.hosts_file.entries, filter_options
-            )
-            preset_info = (
-                f" (preset: {filter_options.preset_name})"
-                if filter_options.preset_name
-                else ""
-            )
-            self.update_status(
-                f"✅ Filter applied: showing {counts['filtered']} of {counts['total']} entries{preset_info}"
-            )
-
-        # Show the filter modal with current options and entries for preview
-        self.push_screen(
-            FilterModal(
-                initial_options=self.current_filter_options,
-                entries=self.hosts_file.entries,
-                entry_filter=self.entry_filter,
-            ),
-            handle_filter_result,
-        )
-
     def _resolve_new_dns_entry(self, entry) -> None:
         """Trigger DNS resolution for a newly added DNS entry."""
         if not hasattr(entry, "dns_name") or not entry.dns_name:

src/hosts/tui/config_modal.py

@@ -14,7 +14,7 @@ from ..core.config import Config
 from .styles import CONFIG_MODAL_CSS
 
 
-class ConfigModal(ModalScreen):
+class ConfigModal(ModalScreen[bool]):
     """
     Modal screen for application configuration.
 

src/hosts/tui/delete_confirmation_modal.py

@@ -14,7 +14,7 @@ from ..core.models import HostEntry
 from .styles import DELETE_CONFIRMATION_MODAL_CSS
 
 
-class DeleteConfirmationModal(ModalScreen):
+class DeleteConfirmationModal(ModalScreen[bool]):
     """
     Modal screen for confirming entry deletion.
 

src/hosts/tui/dns_status_widget.py

@@ -1,155 +0,0 @@
-"""
-DNS status widget for displaying DNS resolution status in the TUI.
-
-This module provides a visual indicator widget that shows the current
-DNS resolution status and allows users to toggle DNS service.
-"""
-
-from textual.widgets import Static
-from textual.reactive import reactive
-from textual.containers import Horizontal
-from ..core.dns import DNSService
-
-
-class DNSStatusWidget(Static):
-    """
-    Widget to display DNS resolution service status.
-
-    Shows visual indicators for DNS service status and resolution progress.
-    """
-
-    # Reactive attributes
-    dns_enabled: reactive[bool] = reactive(False)
-    resolving_count: reactive[int] = reactive(0)
-    resolved_count: reactive[int] = reactive(0)
-    failed_count: reactive[int] = reactive(0)
-
-    def __init__(self, dns_service: DNSService, **kwargs):
-        super().__init__(**kwargs)
-        self.dns_service = dns_service
-        self.dns_enabled = dns_service.enabled
-        self.update_status()
-
-    def compose(self):
-        """Create the DNS status display."""
-        with Horizontal(classes="dns-status-container"):
-            yield Static("", id="dns-status-indicator", classes="dns-indicator")
-            yield Static("", id="dns-status-text", classes="dns-status-text")
-
-    def update_status(self) -> None:
-        """Update the DNS status display."""
-        try:
-            indicator = self.query_one("#dns-status-indicator", Static)
-            text_widget = self.query_one("#dns-status-text", Static)
-
-            if not self.dns_enabled:
-                indicator.update("⭕")
-                text_widget.update("DNS: Disabled")
-                indicator.remove_class("dns-active")
-                indicator.remove_class("dns-resolving")
-                indicator.add_class("dns-disabled")
-            elif self.resolving_count > 0:
-                indicator.update("🔄")
-                text_widget.update(f"DNS: Resolving ({self.resolving_count} pending)")
-                indicator.remove_class("dns-disabled")
-                indicator.remove_class("dns-active")
-                indicator.add_class("dns-resolving")
-            else:
-                indicator.update("✅")
-                status_parts = []
-                if self.resolved_count > 0:
-                    status_parts.append(f"{self.resolved_count} resolved")
-                if self.failed_count > 0:
-                    status_parts.append(f"{self.failed_count} failed")
-
-                if status_parts:
-                    status_text = f"DNS: Active ({', '.join(status_parts)})"
-                else:
-                    status_text = "DNS: Active"
-
-                text_widget.update(status_text)
-                indicator.remove_class("dns-disabled")
-                indicator.remove_class("dns-resolving")
-                indicator.add_class("dns-active")
-
-        except Exception:
-            # Widget not ready yet
-            pass
-
-    def watch_dns_enabled(self, enabled: bool) -> None:
-        """React to DNS service enable/disable changes."""
-        self.update_status()
-
-    def watch_resolving_count(self, count: int) -> None:
-        """React to changes in resolving count."""
-        self.update_status()
-
-    def watch_resolved_count(self, count: int) -> None:
-        """React to changes in resolved count."""
-        self.update_status()
-
-    def watch_failed_count(self, count: int) -> None:
-        """React to changes in failed count."""
-        self.update_status()
-
-    def update_from_service(self) -> None:
-        """Update status from the current DNS service state."""
-        self.dns_enabled = self.dns_service.enabled
-
-        # Count DNS resolution states from the service
-        if hasattr(self.dns_service, "_resolution_cache"):
-            cache = self.dns_service._resolution_cache
-            resolving = sum(1 for r in cache.values() if r.status == "RESOLVING")
-            resolved = sum(
-                1 for r in cache.values() if r.status in ["RESOLVED", "IP_MATCH"]
-            )
-            failed = sum(
-                1
-                for r in cache.values()
-                if r.status in ["RESOLUTION_FAILED", "IP_MISMATCH"]
-            )
-
-            self.resolving_count = resolving
-            self.resolved_count = resolved
-            self.failed_count = failed
-        else:
-            self.resolving_count = 0
-            self.resolved_count = 0
-            self.failed_count = 0
-
-    def toggle_service(self) -> None:
-        """Toggle the DNS service on/off."""
-        if self.dns_service.enabled:
-            self.dns_service.stop()
-        else:
-            self.dns_service.start()
-
-        self.dns_enabled = self.dns_service.enabled
-        self.update_status()
-
-    def get_status_text(self) -> str:
-        """Get current status as text for display purposes."""
-        if not self.dns_enabled:
-            return "DNS Disabled"
-        elif self.resolving_count > 0:
-            return f"DNS Resolving ({self.resolving_count})"
-        else:
-            parts = []
-            if self.resolved_count > 0:
-                parts.append(f"{self.resolved_count} resolved")
-            if self.failed_count > 0:
-                parts.append(f"{self.failed_count} failed")
-
-            if parts:
-                return f"DNS Active ({', '.join(parts)})"
-            else:
-                return "DNS Active"
-
-    def get_status_symbol(self) -> str:
-        """Get current status symbol."""
-        if not self.dns_enabled:
-            return "⭕"
-        elif self.resolving_count > 0:
-            return "🔄"
-        else:
-            return "✅"

src/hosts/tui/filter_modal.py

@@ -1,612 +0,0 @@
-"""
-Filter modal for advanced entry filtering configuration.
-
-This module provides a professional modal dialog for configuring comprehensive
-filtering options including status, type, resolution status, and search filtering.
-"""
-
-from textual.app import ComposeResult
-from textual.containers import Grid, Horizontal, Container
-from textual.widgets import (
-    Static,
-    Button,
-    Checkbox,
-    Input,
-    Select,
-    Label,
-    RadioSet,
-    RadioButton,
-    Collapsible,
-)
-from textual.screen import ModalScreen
-from textual.reactive import reactive
-from textual import on
-from typing import Optional, Dict, List
-
-from ..core.filters import FilterOptions, EntryFilter
-
-
-class FilterModal(ModalScreen[Optional[FilterOptions]]):
-    """Advanced filtering configuration modal."""
-
-    DEFAULT_CSS = """
-    FilterModal {
-        align: center middle;
-    }
-    
-    #filter-dialog {
-        grid-size: 1;
-        grid-gutter: 1 2;
-        grid-rows: auto 1fr auto;
-        padding: 0 1;
-        width: 80;
-        height: auto;
-        border: thick $background 80%;
-        background: $surface;
-        max-height: 90%;
-    }
-    
-    #filter-header {
-        dock: top;
-        width: 1fr;
-        height: 3;
-        content-align: center middle;
-        text-style: bold;
-        background: $primary;
-        color: $text;
-    }
-    
-    #filter-content {
-        layout: vertical;
-        overflow-y: auto;
-        height: auto;
-        max-height: 70vh;
-        padding: 1;
-    }
-    
-    #filter-actions {
-        dock: bottom;
-        layout: horizontal;
-        width: 1fr;
-        height: 3;
-        align: center middle;
-        padding: 0 1;
-        background: $panel;
-    }
-    
-    .filter-section {
-        margin: 1 0;
-        padding: 1;
-        border: round $primary 20%;
-        background: $panel;
-    }
-    
-    .filter-section-title {
-        text-style: bold;
-        color: $primary;
-        margin-bottom: 1;
-    }
-    
-    .filter-checkboxes {
-        layout: vertical;
-        margin: 0 2;
-    }
-    
-    .filter-radios {
-        layout: vertical;
-        margin: 0 2;
-    }
-    
-    .filter-input-row {
-        layout: horizontal;
-        margin: 0 2;
-        height: 3;
-        align: center left;
-    }
-    
-    .filter-input-label {
-        width: 20;
-        content-align: left middle;
-        margin-right: 1;
-    }
-    
-    .filter-input {
-        width: 30;
-    }
-    
-    .preset-row {
-        layout: horizontal;
-        margin: 1 2;
-        height: 3;
-        align: center left;
-    }
-    
-    .preset-select {
-        width: 30;
-        margin-right: 2;
-    }
-    
-    Button {
-        margin: 0 1;
-        min-width: 12;
-    }
-    
-    Checkbox {
-        margin: 0 1;
-    }
-    
-    RadioButton {
-        margin: 0 1;
-    }
-    
-    .count-display {
-        text-style: italic;
-        color: $text-muted;
-        content-align: center middle;
-        height: 1;
-        margin: 1 0;
-    }
-    """
-
-    # Reactive properties for real-time updates
-    current_options: reactive[FilterOptions] = reactive(FilterOptions())
-    entry_counts: reactive[Dict[str, int]] = reactive({})
-
-    def __init__(
-        self,
-        initial_options: Optional[FilterOptions] = None,
-        entries: Optional[List] = None,
-        entry_filter: Optional[EntryFilter] = None,
-    ):
-        """
-        Initialize filter modal.
-
-        Args:
-            initial_options: Current filter options to display
-            entries: List of entries for count preview
-            entry_filter: EntryFilter instance for applying filters
-        """
-        super().__init__()
-        self.current_options = initial_options or FilterOptions()
-        self.entries = entries or []
-        self.entry_filter = entry_filter or EntryFilter()
-        self.entry_counts = self._calculate_counts()
-
-    def compose(self) -> ComposeResult:
-        """Compose the filter modal interface."""
-        with Grid(id="filter-dialog"):
-            yield Static("Advanced Filtering", id="filter-header")
-
-            with Container(id="filter-content"):
-                # Filter presets section
-                with Collapsible(title="Filter Presets", collapsed=False):
-                    with Container(classes="filter-section"):
-                        with Horizontal(classes="preset-row"):
-                            yield Label("Preset:", classes="filter-input-label")
-                            yield Select(
-                                [
-                                    (name, name)
-                                    for name in self.entry_filter.get_preset_names()
-                                ],
-                                value=self.current_options.preset_name,
-                                id="preset-select",
-                                classes="preset-select",
-                            )
-                            yield Button("Load", id="load-preset", variant="primary")
-                            yield Button("Save", id="save-preset")
-                            yield Button("Delete", id="delete-preset", variant="error")
-
-                # Status filtering section
-                with Collapsible(title="Status Filtering", collapsed=False):
-                    with Container(classes="filter-section"):
-                        yield Static("Status Filtering", classes="filter-section-title")
-                        with RadioSet(id="status-filter-type"):
-                            yield RadioButton("Show All", value="all", id="status-all")
-                            yield RadioButton(
-                                "Active Only", value="active", id="status-active"
-                            )
-                            yield RadioButton(
-                                "Inactive Only", value="inactive", id="status-inactive"
-                            )
-                            yield RadioButton(
-                                "Custom", value="custom", id="status-custom"
-                            )
-
-                        with Container(
-                            classes="filter-checkboxes", id="status-custom-options"
-                        ):
-                            yield Checkbox(
-                                "Show Active Entries", value=True, id="show-active"
-                            )
-                            yield Checkbox(
-                                "Show Inactive Entries", value=True, id="show-inactive"
-                            )
-
-                # DNS type filtering section
-                with Collapsible(title="Entry Type Filtering", collapsed=False):
-                    with Container(classes="filter-section"):
-                        yield Static(
-                            "Entry Type Filtering", classes="filter-section-title"
-                        )
-                        with RadioSet(id="type-filter-type"):
-                            yield RadioButton("Show All", value="all", id="type-all")
-                            yield RadioButton(
-                                "DNS Entries Only", value="dns", id="type-dns"
-                            )
-                            yield RadioButton(
-                                "IP Entries Only", value="ip", id="type-ip"
-                            )
-                            yield RadioButton(
-                                "Custom", value="custom", id="type-custom"
-                            )
-
-                        with Container(
-                            classes="filter-checkboxes", id="type-custom-options"
-                        ):
-                            yield Checkbox(
-                                "Show DNS Entries", value=True, id="show-dns"
-                            )
-                            yield Checkbox("Show IP Entries", value=True, id="show-ip")
-
-                # DNS resolution status filtering section
-                with Collapsible(title="Resolution Status Filtering", collapsed=False):
-                    with Container(classes="filter-section"):
-                        yield Static(
-                            "Resolution Status Filtering",
-                            classes="filter-section-title",
-                        )
-                        with RadioSet(id="resolution-filter-type"):
-                            yield RadioButton(
-                                "Show All", value="all", id="resolution-all"
-                            )
-                            yield RadioButton(
-                                "Resolved Only",
-                                value="resolved",
-                                id="resolution-resolved",
-                            )
-                            yield RadioButton(
-                                "Mismatches Only",
-                                value="mismatch",
-                                id="resolution-mismatch",
-                            )
-                            yield RadioButton(
-                                "Custom", value="custom", id="resolution-custom"
-                            )
-
-                        with Container(
-                            classes="filter-checkboxes", id="resolution-custom-options"
-                        ):
-                            yield Checkbox(
-                                "Show Resolved", value=True, id="show-resolved"
-                            )
-                            yield Checkbox(
-                                "Show Unresolved", value=True, id="show-unresolved"
-                            )
-                            yield Checkbox(
-                                "Show Resolving", value=True, id="show-resolving"
-                            )
-                            yield Checkbox("Show Failed", value=True, id="show-failed")
-                            yield Checkbox(
-                                "Show Mismatched", value=True, id="show-mismatched"
-                            )
-
-                # Search filtering section
-                with Collapsible(title="Search Filtering", collapsed=True):
-                    with Container(classes="filter-section"):
-                        yield Static("Search Filtering", classes="filter-section-title")
-
-                        with Horizontal(classes="filter-input-row"):
-                            yield Label("Search term:", classes="filter-input-label")
-                            yield Input(
-                                placeholder="Enter search term...",
-                                value=self.current_options.search_term or "",
-                                id="search-term",
-                                classes="filter-input",
-                            )
-
-                        with Container(classes="filter-checkboxes"):
-                            yield Checkbox(
-                                "Search in hostnames", value=True, id="search-hostnames"
-                            )
-                            yield Checkbox(
-                                "Search in comments", value=True, id="search-comments"
-                            )
-                            yield Checkbox(
-                                "Search in IP addresses", value=True, id="search-ips"
-                            )
-                            yield Checkbox(
-                                "Case sensitive",
-                                value=False,
-                                id="search-case-sensitive",
-                            )
-
-                # Entry count display
-                yield Static("", id="count-display", classes="count-display")
-
-            with Horizontal(id="filter-actions"):
-                yield Button("Apply", id="apply", variant="primary")
-                yield Button("Reset", id="reset")
-                yield Button("Cancel", id="cancel")
-
-    def on_mount(self) -> None:
-        """Initialize the modal with current options."""
-        self._update_ui_from_options()
-        self._update_count_display()
-
-    def _update_ui_from_options(self) -> None:
-        """Update UI controls to reflect current options."""
-        options = self.current_options
-
-        # Status filtering
-        if options.active_only:
-            self.query_one("#status-active", RadioButton).value = True
-        elif options.inactive_only:
-            self.query_one("#status-inactive", RadioButton).value = True
-        elif options.show_active and options.show_inactive:
-            self.query_one("#status-all", RadioButton).value = True
-        else:
-            self.query_one("#status-custom", RadioButton).value = True
-
-        self.query_one("#show-active", Checkbox).value = options.show_active
-        self.query_one("#show-inactive", Checkbox).value = options.show_inactive
-
-        # Type filtering
-        if options.dns_only:
-            self.query_one("#type-dns", RadioButton).value = True
-        elif options.ip_only:
-            self.query_one("#type-ip", RadioButton).value = True
-        elif options.show_dns_entries and options.show_ip_entries:
-            self.query_one("#type-all", RadioButton).value = True
-        else:
-            self.query_one("#type-custom", RadioButton).value = True
-
-        self.query_one("#show-dns", Checkbox).value = options.show_dns_entries
-        self.query_one("#show-ip", Checkbox).value = options.show_ip_entries
-
-        # Resolution status filtering
-        if options.resolved_only:
-            self.query_one("#resolution-resolved", RadioButton).value = True
-        elif options.mismatch_only:
-            self.query_one("#resolution-mismatch", RadioButton).value = True
-        elif (
-            options.show_resolved
-            and options.show_unresolved
-            and options.show_resolving
-            and options.show_failed
-            and options.show_mismatched
-        ):
-            self.query_one("#resolution-all", RadioButton).value = True
-        else:
-            self.query_one("#resolution-custom", RadioButton).value = True
-
-        self.query_one("#show-resolved", Checkbox).value = options.show_resolved
-        self.query_one("#show-unresolved", Checkbox).value = options.show_unresolved
-        self.query_one("#show-resolving", Checkbox).value = options.show_resolving
-        self.query_one("#show-failed", Checkbox).value = options.show_failed
-        self.query_one("#show-mismatched", Checkbox).value = options.show_mismatched
-
-        # Search filtering
-        if options.search_term:
-            self.query_one("#search-term", Input).value = options.search_term
-        self.query_one(
-            "#search-hostnames", Checkbox
-        ).value = options.search_in_hostnames
-        self.query_one("#search-comments", Checkbox).value = options.search_in_comments
-        self.query_one("#search-ips", Checkbox).value = options.search_in_ips
-        self.query_one(
-            "#search-case-sensitive", Checkbox
-        ).value = options.case_sensitive
-
-        self._update_custom_options_visibility()
-
-    def _update_custom_options_visibility(self) -> None:
-        """Show/hide custom option containers based on radio selections."""
-        # Status custom options
-        status_custom = self.query_one("#status-custom", RadioButton).value
-        status_container = self.query_one("#status-custom-options")
-        status_container.display = status_custom
-
-        # Type custom options
-        type_custom = self.query_one("#type-custom", RadioButton).value
-        type_container = self.query_one("#type-custom-options")
-        type_container.display = type_custom
-
-        # Resolution custom options
-        resolution_custom = self.query_one("#resolution-custom", RadioButton).value
-        resolution_container = self.query_one("#resolution-custom-options")
-        resolution_container.display = resolution_custom
-
-    def _calculate_counts(self) -> Dict[str, int]:
-        """Calculate entry counts for current filter options."""
-        if not self.entries:
-            return {}
-        return self.entry_filter.count_filtered_entries(
-            self.entries, self.current_options
-        )
-
-    def _update_count_display(self) -> None:
-        """Update the count display with current filter results."""
-        counts = self._calculate_counts()
-        if counts:
-            count_text = (
-                f"Showing {counts['filtered']} of {counts['total']} entries "
-                f"({counts['active']} active, {counts['inactive']} inactive)"
-            )
-        else:
-            count_text = "No entries to filter"
-
-        self.query_one("#count-display", Static).update(count_text)
-
-    def _get_current_options_from_ui(self) -> FilterOptions:
-        """Extract current filter options from UI controls."""
-        # Status filtering
-        status_type = self.query_one("#status-filter-type", RadioSet).pressed_button
-        if status_type and status_type.id == "status-active":
-            show_active, show_inactive = True, False
-            active_only, inactive_only = True, False
-        elif status_type and status_type.id == "status-inactive":
-            show_active, show_inactive = False, True
-            active_only, inactive_only = False, True
-        elif status_type and status_type.id == "status-all":
-            show_active, show_inactive = True, True
-            active_only, inactive_only = False, False
-        else:  # custom
-            show_active = self.query_one("#show-active", Checkbox).value
-            show_inactive = self.query_one("#show-inactive", Checkbox).value
-            active_only, inactive_only = False, False
-
-        # Type filtering
-        type_type = self.query_one("#type-filter-type", RadioSet).pressed_button
-        if type_type and type_type.id == "type-dns":
-            show_dns_entries, show_ip_entries = True, False
-            dns_only, ip_only = True, False
-        elif type_type and type_type.id == "type-ip":
-            show_dns_entries, show_ip_entries = False, True
-            dns_only, ip_only = False, True
-        elif type_type and type_type.id == "type-all":
-            show_dns_entries, show_ip_entries = True, True
-            dns_only, ip_only = False, False
-        else:  # custom
-            show_dns_entries = self.query_one("#show-dns", Checkbox).value
-            show_ip_entries = self.query_one("#show-ip", Checkbox).value
-            dns_only, ip_only = False, False
-
-        # Resolution status filtering
-        resolution_type = self.query_one(
-            "#resolution-filter-type", RadioSet
-        ).pressed_button
-        if resolution_type and resolution_type.id == "resolution-resolved":
-            resolved_only, mismatch_only = True, False
-            (
-                show_resolved,
-                show_unresolved,
-                show_resolving,
-                show_failed,
-                show_mismatched,
-            ) = True, False, False, False, False
-        elif resolution_type and resolution_type.id == "resolution-mismatch":
-            resolved_only, mismatch_only = False, True
-            (
-                show_resolved,
-                show_unresolved,
-                show_resolving,
-                show_failed,
-                show_mismatched,
-            ) = False, False, False, False, True
-        elif resolution_type and resolution_type.id == "resolution-all":
-            resolved_only, mismatch_only = False, False
-            (
-                show_resolved,
-                show_unresolved,
-                show_resolving,
-                show_failed,
-                show_mismatched,
-            ) = True, True, True, True, True
-        else:  # custom
-            resolved_only, mismatch_only = False, False
-            show_resolved = self.query_one("#show-resolved", Checkbox).value
-            show_unresolved = self.query_one("#show-unresolved", Checkbox).value
-            show_resolving = self.query_one("#show-resolving", Checkbox).value
-            show_failed = self.query_one("#show-failed", Checkbox).value
-            show_mismatched = self.query_one("#show-mismatched", Checkbox).value
-
-        # Search filtering
-        search_term = self.query_one("#search-term", Input).value or None
-        search_hostnames = self.query_one("#search-hostnames", Checkbox).value
-        search_comments = self.query_one("#search-comments", Checkbox).value
-        search_ips = self.query_one("#search-ips", Checkbox).value
-        case_sensitive = self.query_one("#search-case-sensitive", Checkbox).value
-
-        return FilterOptions(
-            show_active=show_active,
-            show_inactive=show_inactive,
-            active_only=active_only,
-            inactive_only=inactive_only,
-            show_dns_entries=show_dns_entries,
-            show_ip_entries=show_ip_entries,
-            dns_only=dns_only,
-            ip_only=ip_only,
-            show_resolved=show_resolved,
-            show_unresolved=show_unresolved,
-            show_resolving=show_resolving,
-            show_failed=show_failed,
-            show_mismatched=show_mismatched,
-            mismatch_only=mismatch_only,
-            resolved_only=resolved_only,
-            search_term=search_term,
-            search_in_hostnames=search_hostnames,
-            search_in_comments=search_comments,
-            search_in_ips=search_ips,
-            case_sensitive=case_sensitive,
-        )
-
-    @on(RadioSet.Changed)
-    def on_radio_changed(self, event: RadioSet.Changed) -> None:
-        """Handle radio button changes."""
-        self._update_custom_options_visibility()
-        self.current_options = self._get_current_options_from_ui()
-        self._update_count_display()
-
-    @on(Checkbox.Changed)
-    @on(Input.Changed)
-    def on_input_changed(self) -> None:
-        """Handle input changes for real-time preview."""
-        self.current_options = self._get_current_options_from_ui()
-        self._update_count_display()
-
-    @on(Button.Pressed, "#apply")
-    def on_apply_pressed(self) -> None:
-        """Handle apply button press."""
-        self.dismiss(self._get_current_options_from_ui())
-
-    @on(Button.Pressed, "#cancel")
-    def on_cancel_pressed(self) -> None:
-        """Handle cancel button press."""
-        self.dismiss(None)
-
-    @on(Button.Pressed, "#reset")
-    def on_reset_pressed(self) -> None:
-        """Handle reset button press."""
-        self.current_options = FilterOptions()
-        self._update_ui_from_options()
-        self._update_count_display()
-
-    @on(Button.Pressed, "#load-preset")
-    def on_load_preset_pressed(self) -> None:
-        """Handle load preset button press."""
-        preset_select = self.query_one("#preset-select", Select)
-        if preset_select.value != Select.BLANK:
-            preset_options = self.entry_filter.load_preset(str(preset_select.value))
-            if preset_options:
-                self.current_options = preset_options
-                self._update_ui_from_options()
-                self._update_count_display()
-
-    @on(Button.Pressed, "#save-preset")
-    def on_save_preset_pressed(self) -> None:
-        """Handle save preset button press."""
-        # TODO: Implement preset name input dialog
-        # For now, just save with a generic name
-        current_options = self._get_current_options_from_ui()
-        preset_name = f"Custom Preset {len(self.entry_filter.presets) + 1}"
-        self.entry_filter.save_preset(preset_name, current_options)
-
-        # Update preset select with new preset
-        preset_select = self.query_one("#preset-select", Select)
-        preset_select.set_options(
-            [(name, name) for name in self.entry_filter.get_preset_names()]
-        )
-        preset_select.value = preset_name
-
-    @on(Button.Pressed, "#delete-preset")
-    def on_delete_preset_pressed(self) -> None:
-        """Handle delete preset button press."""
-        preset_select = self.query_one("#preset-select", Select)
-        if preset_select.value != Select.BLANK:
-            preset_name = str(preset_select.value)
-            if self.entry_filter.delete_preset(preset_name):
-                # Update preset select options
-                preset_select.set_options(
-                    [(name, name) for name in self.entry_filter.get_preset_names()]
-                )
-                preset_select.value = Select.BLANK

src/hosts/tui/save_confirmation_modal.py

@@ -13,7 +13,7 @@ from textual.binding import Binding
 from .styles import SAVE_CONFIRMATION_MODAL_CSS
 
 
-class SaveConfirmationModal(ModalScreen):
+class SaveConfirmationModal(ModalScreen[str]):
     """
     Modal screen for save confirmation when exiting edit entry mode.
 

tests/test_add_entry_modal.py

@@ -6,6 +6,7 @@ DNS name entries, validation, and mutual exclusion logic.
 """
 
 import pytest
+from typing import cast
 from unittest.mock import Mock
 from textual.widgets import Input, Checkbox, RadioSet, Static
 
@@ -177,10 +178,7 @@ class TestAddEntryModalDNSSupport:
         self.modal.query_one = Mock(side_effect=Exception("Widget not found"))
 
         # This should not raise an exception
-        try:
         self.modal._show_error("dns-error", "Test error message")
-        except Exception:
-            pytest.fail("_show_error should handle missing widgets gracefully")
 
 
 class TestAddEntryModalRadioButtonLogic:
@@ -222,7 +220,7 @@ class TestAddEntryModalRadioButtonLogic:
         event = MockEvent()
 
         # Call the event handler
-        self.modal.on_radio_set_changed(event)
+        self.modal.on_radio_set_changed(cast(RadioSet.Changed, event))
 
         # Verify IP section is shown and DNS section is hidden
         mock_ip_section.remove_class.assert_called_with("hidden")
@@ -261,7 +259,7 @@ class TestAddEntryModalRadioButtonLogic:
         event = MockEvent()
 
         # Call the event handler
-        self.modal.on_radio_set_changed(event)
+        self.modal.on_radio_set_changed(cast(RadioSet.Changed, event))
 
         # Verify DNS section is shown and IP section is hidden
         mock_ip_section.add_class.assert_called_with("hidden")
@@ -324,7 +322,7 @@ class TestAddEntryModalSaveLogic:
 
         # Verify validation was called
         self.modal._validate_input.assert_called_once_with(
-            "192.168.1.1", "", "example.com, www.example.com", None
+            "192.168.1.1", "", "example.com, www.example.com", False
         )
 
         # Verify modal was dismissed with a HostEntry

tests/test_dns.py

@@ -125,6 +125,7 @@ class TestResolveHostname:
             assert resolution.hostname == "slow.example"
             assert resolution.resolved_ip is None
             assert resolution.status == DNSResolutionStatus.RESOLUTION_FAILED
+            assert resolution.error_message is not None
             assert "Timeout after 1.0s" in resolution.error_message
             assert resolution.is_success() is False
 
@@ -256,6 +257,7 @@ class TestResolveHostnamesBatch:
             assert resolutions[0].is_success() is True
             assert resolutions[1].hostname == "error.example"
             assert resolutions[1].is_success() is False
+            assert resolutions[1].error_message is not None
             assert "Network error" in resolutions[1].error_message
 
 

tests/test_main.py

@@ -6,6 +6,7 @@ validating application behavior, navigation, and user interactions.
 """
 
 from datetime import datetime
+from typing import Any, cast
 from unittest.mock import AsyncMock, Mock, patch
 
 import pytest
@@ -192,7 +193,7 @@ class TestHostsManagerApp:
                     return mock_active_checkbox
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
 
             # Add test entry
             app.hosts_file = HostsFile()
@@ -248,7 +249,7 @@ class TestHostsManagerApp:
                     return mock_active_checkbox
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
             app.hosts_file = HostsFile()
 
             app.update_entry_details()
@@ -327,7 +328,7 @@ class TestHostsManagerApp:
                     return mock_footer
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
 
             # Add test hosts_file for footer status generation
             app.hosts_file = HostsFile()
@@ -837,7 +838,7 @@ class TestHostsManagerApp:
                     return mock_dns_section
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
 
             app.edit_handler.update_field_visibility(show_ip=True, show_dns=False)
 
@@ -867,7 +868,7 @@ class TestHostsManagerApp:
                     return mock_dns_section
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
 
             app.edit_handler.update_field_visibility(show_ip=False, show_dns=True)
 
@@ -908,7 +909,7 @@ class TestHostsManagerApp:
                     return mock_dns_radio
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
             app.edit_handler.handle_entry_type_change = Mock()
 
             # Test that the method can be called without errors
@@ -962,7 +963,7 @@ class TestHostsManagerApp:
                     return mock_dns_input
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
             app.edit_handler.handle_entry_type_change = Mock()
 
             # Mock the set_timer method to avoid event loop issues in tests
@@ -1017,7 +1018,7 @@ class TestHostsManagerApp:
                     return mock_active_checkbox
                 return Mock()
 
-            app.query_one = mock_query_one
+            cast(Any, app).query_one = mock_query_one
 
             # Add test entry
             app.hosts_file = HostsFile()
@@ -1156,10 +1157,12 @@ class TestHostsManagerApp:
             assert app.hosts_file.entries[0].is_active is False
             assert app.manager.can_undo()
             assert not app.manager.can_redo()
-            app.table_handler.populate_entries_table.assert_called_once()
+            cast(Mock, app.table_handler.populate_entries_table).assert_called_once()
-            app.table_handler.move_cursor_to_entry_index.assert_called_once_with(0)
+            cast(
-            app.details_handler.update_entry_details.assert_called_once()
+                Mock, app.table_handler.move_cursor_to_entry_index
-            app.update_status.assert_called_once_with(
+            ).assert_called_once_with(0)
+            cast(Mock, app.details_handler.update_entry_details).assert_called_once()
+            cast(Mock, app.update_status).assert_called_once_with(
                 "❌ Undo save failed; previous state restored: Permission denied"
             )
 
@@ -1204,10 +1207,12 @@ class TestHostsManagerApp:
             assert app.hosts_file.entries[0].is_active is True
             assert not app.manager.can_undo()
             assert app.manager.can_redo()
-            app.table_handler.populate_entries_table.assert_called_once()
+            cast(Mock, app.table_handler.populate_entries_table).assert_called_once()
-            app.table_handler.move_cursor_to_entry_index.assert_called_once_with(0)
+            cast(
-            app.details_handler.update_entry_details.assert_called_once()
+                Mock, app.table_handler.move_cursor_to_entry_index
-            app.update_status.assert_called_once_with(
+            ).assert_called_once_with(0)
+            cast(Mock, app.details_handler.update_entry_details).assert_called_once()
+            cast(Mock, app.update_status).assert_called_once_with(
                 "❌ Redo save failed; previous state restored: Permission denied"
             )
 
@@ -1234,7 +1239,7 @@ class TestHostsManagerApp:
             assert app.selected_entry_index == 0
             assert not app.manager.can_undo()
             assert app.manager.can_redo()
-            app.update_status.assert_called_once_with(
+            cast(Mock, app.update_status).assert_called_once_with(
                 "❌ Toggle save failed; previous state restored: Permission denied"
             )
 
@@ -1261,7 +1266,7 @@ class TestHostsManagerApp:
             ]
             assert app.selected_entry_index == 1
             assert not app.manager.can_undo()
-            app.update_status.assert_called_once_with(
+            cast(Mock, app.update_status).assert_called_once_with(
                 "❌ Move save failed; previous state restored: Permission denied"
             )
 
@@ -1287,7 +1292,7 @@ class TestHostsManagerApp:
             ]
             assert app.selected_entry_index == 0
             assert not app.manager.can_undo()
-            app.update_status.assert_called_once_with(
+            cast(Mock, app.update_status).assert_called_once_with(
                 "❌ Add save failed; previous state restored: Permission denied"
             )
 
@@ -1378,7 +1383,7 @@ class TestHostsManagerApp:
             ]
             assert app.selected_entry_index == 1
             assert not app.manager.can_undo()
-            app.update_status.assert_called_once_with(
+            cast(Mock, app.update_status).assert_called_once_with(
                 "❌ Delete save failed; previous state restored: Permission denied"
             )
 
@@ -1503,7 +1508,7 @@ class TestHostsManagerApp:
             assert entry.last_resolved == original_time
             assert entry.dns_resolution_status == "match"
             assert app.selected_entry_index == 0
-            app.update_status.assert_any_call(
+            cast(Mock, app.update_status).assert_any_call(
                 "❌ DNS refresh save failed; previous state restored: Permission denied"
             )
 
@@ -1549,7 +1554,7 @@ class TestHostsManagerApp:
             assert entry.resolved_ip == "192.0.2.1"
             assert entry.last_resolved == original_time
             assert entry.dns_resolution_status == "match"
-            app.update_status.assert_any_call(
+            cast(Mock, app.update_status).assert_any_call(
                 "❌ DNS refresh save failed; previous state restored: Permission denied"
             )
 
@@ -1638,7 +1643,7 @@ class TestHostsManagerApp:
             assert restored.dns_resolution_status is None
             assert restored.is_active is False
             assert app.manager.can_undo()
-            app.update_status.assert_any_call(
+            cast(Mock, app.update_status).assert_any_call(
                 "❌ DNS activation save failed; previous state restored: Permission denied"
             )
 

uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.13"
 
 [[package]]
@@ -16,18 +16,26 @@ name = "hosts"
 version = "0.1.0"
 source = { editable = "." }
 dependencies = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-    { name = "ruff" },
     { name = "textual" },
 ]
 
+[package.dev-dependencies]
+dev = [
+    { name = "pytest" },
+    { name = "pytest-asyncio" },
+    { name = "ruff" },
+    { name = "ty" },
+]
+
 [package.metadata]
-requires-dist = [
+requires-dist = [{ name = "textual", specifier = ">=5.0.1" }]
+
+[package.metadata.requires-dev]
+dev = [
     { name = "pytest", specifier = ">=8.4.1" },
     { name = "pytest-asyncio", specifier = ">=0.21.0" },
     { name = "ruff", specifier = ">=0.12.5" },
-    { name = "textual", specifier = ">=5.0.1" },
+    { name = "ty", specifier = ">=0.0.78" },
 ]
 
 [[package]]
@@ -210,6 +218,31 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/cf/94/976d89db23efed9f3114403faf3f767ec707bfca469a93d0fb715cd352fa/textual-5.0.1-py3-none-any.whl", hash = "sha256:816eab21d22a702b3858ee23615abccaf157c05d386e82968000084c3c2c26aa", size = 699674, upload-time = "2025-07-25T19:50:57.686Z" },
 ]
 
+[[package]]
+name = "ty"
+version = "0.0.78"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/d8/c7/2ba0861384c5b5097ac354383abb98188112cb330208c21d5197e98a29e5/ty-0.0.78.tar.gz", hash = "sha256:770b45854f85fa11595208f08c0f28df80943164d10a2832d86be6ac29f135b2", size = 7050609, upload-time = "2026-09-02T22:41:33.92Z" }
+wheels = [
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+    { url = "https://files.pythonhosted.org/packages/1c/28/5576e2a08b57676d9b2a736d528f077a6c6e32c3d1de2d75dbbe28346966/ty-0.0.78-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:cbe7e3709ccf29ef3d9f58f5914cc30ec36fb647008a5a4ff8483abe401bfe8d", size = 12928383, upload-time = "2026-09-02T22:40:59.162Z" },
+    { url = "https://files.pythonhosted.org/packages/8e/e0/027d49c3da5235e634da3d3fc52c4874ec89f50830388c9c259f8fb71e0e/ty-0.0.78-py3-none-macosx_11_0_arm64.whl", hash = "sha256:c3528897b3ab9d3589561bc2b5e61a4d5d686de527a4400bb09a439b922a6c70", size = 12730058, upload-time = "2026-09-02T22:41:01.235Z" },
+    { url = "https://files.pythonhosted.org/packages/bb/bc/6bf8ffefd8063730a70ae889cf85def72bc155fd1453135ebf8a09c2f1c2/ty-0.0.78-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:8bfba4c44a06484093f527b8ef43a317abcf91395b49396170266629eedf74aa", size = 12813321, upload-time = "2026-09-02T22:41:03.251Z" },
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+]
+
 [[package]]
 name = "typing-extensions"
 version = "4.14.1"