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>

services/indexer/src/strategies/popular-repos.ts

@@ -111,7 +111,7 @@ export class PopularReposCrawler {
         for (const repo of response.data.items) {
           if (!repo.archived) {
             results.push({
-              owner: repo.owner.login,
+              owner: repo.owner!.login,
               repo: repo.name,
               stars: repo.stargazers_count,
               forks: repo.forks_count,