Fix Worker hang and hydration mismatches on protected routes

[stylessh]

Summary

• Non-blocking detail loaders: PR/issue/review detail routes now use prefetchQuery instead of await ensureQueryData, so navigation is never blocked by server function RPCs. Cached data displays instantly with background revalidation; cache misses show the skeleton.
• Fix hydration mismatches: Gated dashboard counts on hasMounted and provided a proper server snapshot for useTabs so the server and client first render produce identical HTML.
• Serialize concurrent RPCs: Revalidation polling now invalidates tab queries one at a time (instead of all in parallel) with a 5s initial delay. Route preloading is also serialized to avoid overwhelming the Worker.
• Remove forced refetches: Dropped refetchOnMount: "always" and refetchOnWindowFocus: "always" from detail/page query options — webhook-based revalidation signals handle freshness, so staleTime is sufficient.
• GitHub request policy: Added a shared 12s AbortSignal.timeout and bounded retries for all Octokit requests to prevent individual API calls from hanging the Worker.
• Pin TanStack versions: Replaced "latest" with ~ pinned versions to prevent surprise breakage from upstream releases.

Test plan

• pnpm --filter @diffkit/dashboard check-types
• pnpm --filter @diffkit/dashboard lint
• pnpm --filter @diffkit/dashboard build
• pnpm --filter @diffkit/dashboard test
• Manual: verify no hydration warnings in browser console on initial load
• Manual: navigate to a PR detail page — should show skeleton or cached data instantly without blocking
• Manual: verify revalidation polling updates data silently without loaders

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	831e2ad	Commit Preview URL Branch Preview URL	Apr 11 2026, 06:24 PM