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/components/ActivityFeed.tsx

@@ -110,7 +110,7 @@ export default function ActivityFeed({
       clearInterval(statusInterval);
       clearInterval(quoteInterval);
     };
-  }, [onActivityChange]);
+  }, [onActivityChange, allQuotes.length]);
 
   if (loading) {
     return <div className="animate-pulse space-y-4">