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/CurrentlyReading.test.tsx

@@ -11,6 +11,7 @@ jest.mock("next-intl", () => ({
 // Mock next/image
 jest.mock("next/image", () => ({
   __esModule: true,
+  // eslint-disable-next-line @next/next/no-img-element
   default: (props: React.ImgHTMLAttributes<HTMLImageElement>) => <img {...props} alt={props.alt || ""} />,
 }));