feat(modal): add edit mode with anchored dropdowns and keyboard workflow

- Add TaskDetailModal edit mode with form validation, tags + annotations editing, and SaveEdits event
- Anchor dropdown/suggestion menus using deferred/anchored overlay to avoid clipping
- Add modal-specific keymap contexts (ModalInput/ModalDropdown) for Esc/Ctrl+Enter/Tab navigation
- Refresh modal project suggestions from tasks; improve project child filtering boundary match
- Small UI polish (toast styling, layout spacing) and update shortcuts docs

src/ui.rs

@@ -180,3 +180,17 @@ pub fn mix_color(base: Color, tint: Color, amount: f32) -> Color {
         a: 1.0,
     }
 }
+
+pub fn focus_wrap(child: impl IntoElement, focused: bool, theme: &Theme) -> gpui::Div {
+    let border_color = if focused {
+        theme.focus_ring
+    } else {
+        gpui::rgba(0x00000000)
+    };
+
+    gpui::div()
+        .border_2()
+        .border_color(border_color)
+        .rounded_md()
+        .child(child)
+}