feat(quick-7): wire frontend pin-default-playlist feature end-to-end

- Add pinDefault state, getter, setter to favorites-store
- Add pinDefault getter and setPinDefault to favorites-controller
- Update sortedEntries in playlist-view to pin default playlist to top
- Add Pin to Top toggle in config page Favorites section
- Add Wails bindings for GetPinDefaultPlaylist/SetPinDefaultPlaylist
- React to PinDefault in FavoritesConfigChanged event payload

frontend/src/components/config-page/config-page.ts

@@ -819,6 +819,21 @@ export class ConfigPage extends LitElement {
             });
     };
 
+    private handlePinDefaultChange = (
+        e: CustomEvent<ConfigFieldChangeEvent>,
+    ): void => {
+        const pin = Boolean(e.detail.value);
+
+        this.favCtrl
+            .setPinDefault(pin)
+            .catch((err: unknown) => {
+                console.error(
+                    'Failed to set pin default:',
+                    err,
+                );
+            });
+    };
+
     // ===================================================================
     // TRACK LIST COLUMN HANDLERS
     // ===================================================================
@@ -1082,6 +1097,18 @@ export class ConfigPage extends LitElement {
                         .iconStyle}
                     @config-change=${this.handleFavIconStyleChange}
                 ></config-field>
+
+                <config-field
+                    .schema=${{
+                        key: 'pinDefaultPlaylist',
+                        label: 'Pin to Top',
+                        description:
+                            'Always show the default playlist first, regardless of sort order.',
+                        type: 'toggle' as const,
+                    }}
+                    .value=${this.favCtrl.pinDefault}
+                    @config-change=${this.handlePinDefaultChange}
+                ></config-field>
             </config-section>
         `;
     }

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

@@ -1042,6 +1042,22 @@ export class PlaylistView
             this.sortDirection === 'asc' ? 1 : -1;
 
         return [...entries].sort((a, b) => {
+            // Pin default playlist to top when enabled.
+            if (this.favCtrl.pinDefault) {
+                const aIsDefault =
+                    a.summary.ID ===
+                    this.favCtrl.playlistId;
+                const bIsDefault =
+                    b.summary.ID ===
+                    this.favCtrl.playlistId;
+
+                if (aIsDefault && !bIsDefault)
+                    return -1;
+
+                if (!aIsDefault && bIsDefault)
+                    return 1;
+            }
+
             let cmp = 0;
 
             switch (this.sortField) {