* perf: speed up Reviews list (My PRs + All PRs)
Push the "My PRs" author filter into the threads.search metadata
(pr.author containment) instead of scanning up to 1000 reviewer threads
in Python, and replace the per-repo GitHub access check (an N+1 of
sequential GET /repos calls) with a single per-login accessible-repo set,
cached for 60s. Detail endpoints still re-validate access live.
Frontend: prefetch the inactive tab and adjacent page on hover/focus so
tab switches and pagination are instant.
* fix: don't cache repo access for the reviews list
The /reviews list is an authorization boundary for private PR metadata
(repo/PR titles, branches, authors, finding counts). A cross-request TTL
cache on the accessible-repo set could surface that metadata for up to
60s after a user lost repo access. Resolve the set fresh per request
instead — still a fixed, repo-count-independent burst of GitHub calls
(no per-repo N+1), with no staleness.
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Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
