chore(web): minor UX improvements of "view asset owners" feature (#24319)

* feat: toggle in options modal

* feat(i18n): add labels to display who uploaded each asset and show asset owners

* feat: migrate asset owner settings to TimelineManager and update AlbumOptionsModal

* Revert "feat(i18n): add labels to display who uploaded each asset and show asset owners"

This reverts commit cf8f4eb135.

* fix: simplify AlbumOptionsModal invocation and update aria-label for asset owners

* feat(i18n): add label for viewing asset owners in the interface

* feat: add tests for showAssetOwners functionality in TimelineManager

* chore: move asset owner visibility toggle to kebabu menu

web/src/lib/managers/timeline-manager/timeline-manager.svelte.spec.ts

@@ -692,4 +692,42 @@ describe('TimelineManager', () => {
       expect(discoveredAssets.size).toBe(assetCount);
     });
   });
+
+  describe('showAssetOwners', () => {
+    const LS_KEY = 'album-show-asset-owners';
+
+    beforeEach(() => {
+      // ensure clean state
+      globalThis.localStorage?.removeItem(LS_KEY);
+    });
+
+    it('defaults to false', () => {
+      const timelineManager = new TimelineManager();
+      expect(timelineManager.showAssetOwners).toBe(false);
+    });
+
+    it('setShowAssetOwners updates value', () => {
+      const timelineManager = new TimelineManager();
+      timelineManager.setShowAssetOwners(true);
+      expect(timelineManager.showAssetOwners).toBe(true);
+      timelineManager.setShowAssetOwners(false);
+      expect(timelineManager.showAssetOwners).toBe(false);
+    });
+
+    it('toggleShowAssetOwners flips value', () => {
+      const timelineManager = new TimelineManager();
+      expect(timelineManager.showAssetOwners).toBe(false);
+      timelineManager.toggleShowAssetOwners();
+      expect(timelineManager.showAssetOwners).toBe(true);
+      timelineManager.toggleShowAssetOwners();
+      expect(timelineManager.showAssetOwners).toBe(false);
+    });
+
+    it('persists across instances via localStorage', () => {
+      const a = new TimelineManager();
+      a.setShowAssetOwners(true);
+      const b = new TimelineManager();
+      expect(b.showAssetOwners).toBe(true);
+    });
+  });
 });