fix: replace img tags with next/image, fix useEffect deps, suppress test mock warnings

- projects/page.tsx & projects/[slug]/page.tsx: <img> → <Image fill unoptimized>
- ActivityFeed.tsx: add allQuotes.length to useEffect deps
- Test mocks: eslint-disable for intentional <img> in next/image mocks

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app/__tests__/components/Hero.test.tsx

@@ -30,6 +30,7 @@ interface ImageProps {
 jest.mock('next/image', () => ({
   __esModule: true,
   default: ({ src, alt, fill, priority, ...props }: ImageProps) => (
+    // eslint-disable-next-line @next/next/no-img-element
     <img 
       src={src} 
       alt={alt}