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/projects/page.tsx

@@ -3,6 +3,7 @@
 import { useState, useEffect } from "react";
 import { motion } from 'framer-motion';
 import { ExternalLink, Github, Calendar, ArrowLeft, Search } from 'lucide-react';
+import Image from 'next/image';
 import Link from 'next/link';
 import { useLocale, useTranslations } from "next-intl";
 
@@ -159,9 +160,11 @@ const ProjectsPage = () => {
               <div className="relative aspect-[16/10] overflow-hidden bg-stone-100">
                 {project.imageUrl ? (
                   <>
-                    <img 
+                    <Image 
                       src={project.imageUrl}
                       alt={project.title}
+                      fill
+                      unoptimized
                       className="w-full h-full object-cover transition-transform duration-1000 ease-out group-hover:scale-110"
                     />
                     <div className="absolute inset-0 bg-gradient-to-t from-stone-900/20 to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />