V3 UI Polish: Improved keyboard navigation, fixed logo position, and updated branding

- Fix V3 keyboard navigation delay (resolved NK-wjats7)
- Update V3 document title to 'neko' (resolved NK-4p3s91)
- Fix V3 neko logo/button position to be top-left fixed (resolved NK-89za3s)
- Improve FeedItems (React) stability with ref-based index tracking and robust tests
- Sync V3 styling and selection feedback with V2 patterns
- Rebuild production assets

1 files changed, 21 insertions, 0 deletions

diff --git a/frontend-vanilla/src/main.test.ts b/frontend-vanilla/src/main.test.ts
index c9d0e0c..5bf9fe0 100644
--- a/frontend-vanilla/src/main.test.ts
+++ b/frontend-vanilla/src/main.test.ts
@@ -347,4 +347,25 @@ describe('main application logic', () => {
         expect(manageSection?.innerHTML).toContain('My Feed');
         expect(document.querySelector('.feed-tag-input')).not.toBeNull();
     });
+
+    it('should navigate items with j/k keys', () => {
+        store.setItems([
+            { _id: 101, title: 'Item 1', publish_date: '2023-01-01', read: false } as any,
+            { _id: 102, title: 'Item 2', publish_date: '2023-01-02', read: false } as any
+        ]);
+        renderLayout();
+        renderItems();
+
+        // 1st press 'j' -> index 0
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'j' }));
+        expect(document.querySelector('.feed-item[data-id="101"]')?.classList.contains('selected')).toBe(true);
+
+        // 2nd press 'j' -> index 1
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'j' }));
+        expect(document.querySelector('.feed-item[data-id="102"]')?.classList.contains('selected')).toBe(true);
+
+        // Press 'k' -> back to index 0
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'k' }));
+        expect(document.querySelector('.feed-item[data-id="101"]')?.classList.contains('selected')).toBe(true);
+    });
 });