style: unify New Session dialog focus highlight to accent

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

src/hqt/tui/styles.tcss

@@ -90,3 +90,15 @@ ProjectFormScreen, NewSessionScreen, SchedulePromptScreen {
     background: $surface-lighten-1;
     color: $foreground;
 }
+
+/* Unify the focus highlight across the New Session dialog. The buttons get a
+   Peach $accent focus highlight (above), but Switch/Checkbox/Select/Input
+   otherwise fall back to Textual's default Lavender $border focus border, which
+   reads as off-palette next to the buttons. Match `tall` so only the color
+   changes, not the control height. */
+#new-session-dialog Switch:focus,
+#new-session-dialog Checkbox:focus,
+#new-session-dialog Select:focus,
+#new-session-dialog Input:focus {
+    border: tall $accent;
+}

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