style: unify New Session dialog focus highlight to accent

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_tui.py

@@ -1895,3 +1895,21 @@ async def test_sandbox_options_hidden_until_switch_on():
         switch.value = False
         await pilot.pause()
         assert options.display is False
+
+
+def test_dialog_focus_highlight_uses_accent():
+    """Every focusable control in the New Session dialog shares the Peach accent
+    focus border (consistent with the dialog buttons), not Textual's default
+    Lavender. Guards against the scoped :focus rule being dropped."""
+    from pathlib import Path
+    import hqt.tui
+
+    css = (Path(hqt.tui.__file__).parent / "styles.tcss").read_text()
+    for selector in (
+        "#new-session-dialog Switch:focus",
+        "#new-session-dialog Checkbox:focus",
+        "#new-session-dialog Select:focus",
+        "#new-session-dialog Input:focus",
+    ):
+        assert selector in css, f"missing focus rule: {selector}"
+    assert "border: tall $accent;" in css