feat(16-01): wire shortcut:select-all listener in track-list, queue-panel, and playlist-view

- Add handleSelectAll bound handler calling selection.selectAll() in all three components
- Register/unregister event listeners in connectedCallback/disconnectedCallback

frontend/src/components/playlist-view/playlist-view.ts

@@ -277,6 +277,10 @@ export class PlaylistView
             this.closePlaylistContextMenu();
         };
 
+    private handleSelectAll = (): void => {
+        this.selection.selectAll();
+    };
+
     private clearSelectionHandler = (e: MouseEvent) => {
         const path = e.composedPath();
         const isTrackClick = path.some(
@@ -1196,6 +1200,10 @@ export class PlaylistView
             'mousedown',
             this.sortDropdownCloseHandler,
         );
+        document.addEventListener(
+            'shortcut:select-all',
+            this.handleSelectAll,
+        );
     }
 
     override disconnectedCallback() {
@@ -1226,6 +1234,10 @@ export class PlaylistView
             'mousedown',
             this.sortDropdownCloseHandler,
         );
+        document.removeEventListener(
+            'shortcut:select-all',
+            this.handleSelectAll,
+        );
     }
 
     override updated() {

frontend/src/components/queue-panel/queue-panel.ts

@@ -92,6 +92,10 @@ export class QueuePanel
     @query('track-details')
     private trackDetailsDialog!: TrackDetails;
 
+    private handleSelectAll = (): void => {
+        this.selection.selectAll();
+    };
+
     private closePickerHandler = (e: MouseEvent) => {
         const path = e.composedPath();
         const popup = this.addToPlaylistPopup;
@@ -475,6 +479,10 @@ export class QueuePanel
             'dragend',
             this.onDocumentDragEnd,
         );
+        document.addEventListener(
+            'shortcut:select-all',
+            this.handleSelectAll,
+        );
     }
 
     override disconnectedCallback() {
@@ -499,6 +507,10 @@ export class QueuePanel
             'dragend',
             this.onDocumentDragEnd,
         );
+        document.removeEventListener(
+            'shortcut:select-all',
+            this.handleSelectAll,
+        );
     }
 
     override updated() {

frontend/src/components/track-list/track-list.ts

@@ -151,6 +151,10 @@ export class TrackList extends LitElement implements SelectionHost, ContextMenuH
     private prevSortField: string | null = null;
     private prevSortDir: SortDirection = 'asc';
 
+    private handleSelectAll = (): void => {
+        this.selection.selectAll();
+    };
+
     private clearSelectionHandler = (e: MouseEvent) => {
         const path = e.composedPath();
         const isTrackClick = path.some(
@@ -1030,6 +1034,7 @@ export class TrackList extends LitElement implements SelectionHost, ContextMenuH
         }
         document.addEventListener('mousedown', this.sortDropdownCloseHandler);
         document.addEventListener('click', this.clearSelectionHandler);
+        document.addEventListener('shortcut:select-all', this.handleSelectAll);
         document.addEventListener('mousemove', this.onColResizeMove);
         document.addEventListener('mouseup', this.onColResizeEnd);
 
@@ -1051,6 +1056,7 @@ export class TrackList extends LitElement implements SelectionHost, ContextMenuH
         super.disconnectedCallback();
         document.removeEventListener('mousedown', this.sortDropdownCloseHandler);
         document.removeEventListener('click', this.clearSelectionHandler);
+        document.removeEventListener('shortcut:select-all', this.handleSelectAll);
         document.removeEventListener('mousemove', this.onColResizeMove);
         document.removeEventListener('mouseup', this.onColResizeEnd);