Fix #2: fall back to uppercase N

tests/test_app.py

@@ -183,6 +183,21 @@ async def test_enhanced_shift_n_opens_new_from_selected_but_caps_lock_n_does_not
         assert not isinstance(app.screen, AddEntryModal)
 
 
+@pytest.mark.asyncio
+async def test_uppercase_n_is_a_fallback_when_the_terminal_lacks_enhanced_keys():
+    """Legacy terminals use uppercase N for Shift+N and Caps Lock+N alike."""
+    app = app_with_filterable_entries()
+    app.edit_mode = True
+
+    async with app.run_test(size=(120, 40)) as pilot:
+        app.table_handler.populate_entries_table()
+        app.query_one("#entries-table").focus()
+        await pilot.press("N")
+        await pilot.pause()
+
+        assert isinstance(app.screen, AddEntryModal)
+
+
 @pytest.mark.asyncio
 async def test_new_from_selected_requires_a_visible_host_entry():
     """Shift+N does not reuse a stale selection when filters hide every entry."""