feat: Add GlitchTip error monitoring with Sentry SDK

- Install @sentry/nextjs
- Add sentry.client.config.ts, sentry.server.config.ts, sentry.edge.config.ts
- Conditional initialization based on GLITCHTIP_DSN env variable
- Add /api/glitchtip-tunnel route to bypass ad blockers
- Update next.config.mjs with withSentryConfig wrapper
- Integrate Sentry.captureException in error.tsx and global-error.tsx
- Support env vars: GLITCHTIP_DSN, NEXT_PUBLIC_GLITCHTIP_DSN, GLITCHTIP_URL, etc.

sentry.client.config.ts

@@ -0,0 +1,36 @@
+import * as Sentry from "@sentry/nextjs";
+
+const GLITCHTIP_DSN = process.env.NEXT_PUBLIC_GLITCHTIP_DSN;
+
+// Only initialize Sentry if DSN is configured
+if (GLITCHTIP_DSN) {
+    Sentry.init({
+        dsn: GLITCHTIP_DSN,
+
+        // Environment
+        environment: process.env.NODE_ENV,
+
+        // Sample rate for error events (1.0 = 100%)
+        sampleRate: 1.0,
+
+        // Performance monitoring sample rate (0.1 = 10%)
+        tracesSampleRate: 0.1,
+
+        // Use tunnel to bypass ad blockers
+        tunnel: "/api/glitchtip-tunnel",
+
+        // Disable debug in production
+        debug: process.env.NODE_ENV === "development",
+
+        // Ignore common non-actionable errors
+        ignoreErrors: [
+            "ResizeObserver loop limit exceeded",
+            "ResizeObserver loop completed with undelivered notifications",
+            "Non-Error promise rejection captured",
+        ],
+    });
+
+    console.log("[Sentry] Client initialized with GlitchTip");
+} else {
+    console.log("[Sentry] Client disabled - no DSN configured");
+}