fix: filter stale closed roulette issues

[vahapogut]

Fixes #20

Summary

• Keep closed issues from lingering in the roulette by reducing the page revalidation window from one hour to five minutes.
• Defensively require issue.state === "open" before adding an issue to the roulette pool.
• Let Biome format/import-sort the touched client component so the repo check passes.

Verification

• bun install --frozen-lockfile
• bun run check
• bun run build passed; it emitted GitHub API rate-limit/ECONNRESET warnings while fetching org issues, but the build completed successfully.
• git diff --check

[vercel]

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