feat: add task creation, deletion, and modal focus restoration

Implemented task creation flow with keyboard shortcut (c) and UI button. Added task deletion with confirmation dialog,
accessible via Delete key or per-row delete button. Fixed modal close behavior to restore
focus and reselect the appropriate task (created task for new tasks, original task for view/edit).
Enhanced tag and project autocomplete with hierarchical project suggestions and tag filtering

src/view/task_detail_modal/render/panel.rs

@@ -104,6 +104,7 @@ where
 pub(super) fn render_task_detail_panel<OnCloseClick>(
     detail: &task::TaskDetailVm,
     mode: ModalMode,
+    is_create: bool,
     edit_state: EditState,
     form: &TaskForm,
     errors: &HashMap<FieldId, gpui::SharedString>,
@@ -129,6 +130,7 @@ where
     OnCloseClick: Fn(&gpui::MouseDownEvent, &mut gpui::Window, &mut gpui::App) + 'static,
 {
     let is_editing = mode == ModalMode::Edit;
+    let is_creating = is_create;
     let is_navigating = edit_state == EditState::Navigating;
     let status_label = if is_editing {
         form.status.clone().into()
@@ -204,7 +206,7 @@ where
         );
     }
 
-    if is_editing {
+    if is_editing && !is_creating {
         badges.push(
             Chip::new("Editing")
                 .variant(ChipVariant::Info)
@@ -224,7 +226,11 @@ where
     } else {
         detail.overview.description.clone()
     };
-    let title = format!("{} {}", id_label, title_description);
+    let title = if is_creating {
+        "New task".to_string()
+    } else {
+        format!("{} {}", id_label, title_description)
+    };
 
     let on_close_click = Arc::new(on_close_click);
     let header = render_header(title, badges, is_editing, theme, cx, on_close_click.clone());
@@ -303,6 +309,7 @@ where
     let footer = render_footer(
         detail,
         is_editing,
+        is_creating,
         is_navigating,
         errors,
         form,
@@ -1015,6 +1022,7 @@ fn render_extras_section(detail: &TaskDetailVm, value_color: gpui::Rgba) -> Opti
 fn render_footer(
     detail: &TaskDetailVm,
     is_editing: bool,
+    is_creating: bool,
     is_navigating: bool,
     errors: &HashMap<FieldId, gpui::SharedString>,
     form: &TaskForm,
@@ -1027,7 +1035,27 @@ fn render_footer(
 ) -> gpui::Div {
     let mut action_row = gpui::div().flex().items_center().gap_2();
 
-    if is_editing {
+    if is_creating {
+        let cancel_create_handler = Arc::new(cx.listener(|modal, _event, window, cx| {
+            modal.close(Some(window), cx);
+        }));
+
+        let create_handler = Arc::new(cx.listener(|modal, _event, _window, cx| {
+            modal.submit_create(cx);
+        }));
+
+        let cancel_button =
+            ActionButton::new("Cancel (Esc)").on_click(move |event, window, app| {
+                (cancel_create_handler)(event, window, app);
+            });
+
+        let create_button =
+            ActionButton::new("Create (Ctrl+S)").on_click(move |event, window, app| {
+                (create_handler)(event, window, app);
+            });
+
+        action_row = action_row.child(cancel_button).child(create_button);
+    } else if is_editing {
         let cancel_edit_handler = Arc::new(cx.listener(|modal, _event, window, cx| {
             modal.cancel_edit(Some(window), cx);
         }));