sync: Redis caching, progress bar rewrite, sentry filtering, UI improvements

- Add Redis caching to all pages and uncached API routes
- Rewrite progress bar with direct DOM manipulation for search/filters/navigation
- Filter generic network errors from Sentry client reporting
- Fix non-null assertion for repo.owner in popular-repos strategy
- Remove next-nprogress-bar dependency

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/sentry.client.config.ts

@@ -37,6 +37,8 @@ Sentry.init({
     "Error in input stream",
     // Network fetch failures (Safari / mobile)
     "Load failed",
+    // Generic network errors (client connectivity issues)
+    "network error",
     // Browser extension noise (translation/accessibility extensions)
     /Object Not Found Matching Id/,
     // ResizeObserver loop limit — browser quirk, not actionable