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.

next.config.mjs

@@ -1,7 +1,10 @@
+import { withSentryConfig } from "@sentry/nextjs";
+
 /** @type {import('next').Config} */
 const nextConfig = {
     output: 'standalone',
-    productionBrowserSourceMaps: false,
+    // Enable source maps for Sentry stack traces in production
+    productionBrowserSourceMaps: !!process.env.GLITCHTIP_DSN,
     experimental: {
         serverActions: {
             bodySizeLimit: '10mb',
@@ -9,4 +12,33 @@ const nextConfig = {
     },
 };
 
-export default nextConfig;
+// Wrap with Sentry only if DSN is configured
+const sentryEnabled = !!process.env.GLITCHTIP_DSN || !!process.env.NEXT_PUBLIC_GLITCHTIP_DSN;
+
+const sentryWebpackPluginOptions = {
+    // Suppresses source map uploading logs during build
+    silent: true,
+
+    // Organization and project slugs (optional - for source map upload)
+    org: process.env.GLITCHTIP_ORG,
+    project: process.env.GLITCHTIP_PROJECT,
+
+    // GlitchTip server URL
+    sentryUrl: process.env.GLITCHTIP_URL,
+
+    // Auth token for source map upload
+    authToken: process.env.GLITCHTIP_AUTH_TOKEN,
+
+    // Hides source maps from generated client bundles
+    hideSourceMaps: true,
+
+    // Automatically tree-shake Sentry logger statements
+    disableLogger: true,
+
+    // Prevent bundling of native binaries
+    widenClientFileUpload: true,
+};
+
+export default sentryEnabled
+    ? withSentryConfig(nextConfig, sentryWebpackPluginOptions)
+    : nextConfig;