feat: Complete GlitchTip error monitoring integration

- Add sentry.client.config.ts, sentry.server.config.ts, sentry.edge.config.ts
- Create /api/glitchtip-tunnel route for bypassing ad blockers
- Add SentryInit component for client-side initialization
- Add instrumentation.ts for server/edge initialization
- Integrate Sentry.captureException in error handlers
- Remove test button after verifying integration works

Env vars: NEXT_PUBLIC_GLITCHTIP_DSN, GLITCHTIP_DSN

src/app/page.tsx

@@ -226,6 +226,7 @@ export default function Home() {
                     <HeroBanner />
                 </div>
 
+
                 {/* 3. Quick Actions Grid */}
                 <div className="px-4 mb-4">
                     <QuickActionsGrid />