Add guided env setup modal

tests/test_settings.py

@@ -3,7 +3,7 @@ from pathlib import Path
 import pytest
 
 from pve_vm_setup.errors import SettingsError
-from pve_vm_setup.settings import AppSettings
+from pve_vm_setup.settings import AppSettings, resolve_dotenv_paths, write_config_dotenv
 
 
 def test_settings_load_defaults_and_normalize_api_base() -> None:
@@ -152,3 +152,37 @@ def test_settings_prefers_environment_over_config_and_current_directory_dotenv(
     )
 
     assert settings.proxmox_url == "https://env.example.invalid:8006"
+
+
+def test_resolve_dotenv_paths_uses_standard_config_location(tmp_path: Path, monkeypatch) -> None:
+    home = tmp_path / "home"
+    monkeypatch.setenv("HOME", str(home))
+
+    paths = resolve_dotenv_paths()
+
+    assert paths.cwd == Path(".env")
+    assert paths.config == home / ".config" / "pve-vm-setup" / ".env"
+    assert paths.any_exists is False
+
+
+def test_write_config_dotenv_creates_parent_directory_and_skips_blank_values(
+    tmp_path: Path,
+) -> None:
+    target = tmp_path / "home" / ".config" / "pve-vm-setup" / ".env"
+
+    written_path = write_config_dotenv(
+        {
+            "PROXMOX_URL": "https://pve.example.invalid:8006",
+            "PROXMOX_USER": "root",
+            "PROXMOX_PASSWORD": "",
+        },
+        config_dotenv_path=target,
+    )
+
+    assert written_path == target
+    assert target.exists()
+    assert target.read_text(encoding="utf-8") == (
+        "# Generated by pve-vm-setup\n"
+        "PROXMOX_URL=https://pve.example.invalid:8006\n"
+        "PROXMOX_USER=root\n"
+    )