feat: add job detail and listing pages with real-time status

[abrichr]

Summary

• Job detail page (/jobs/[id]): Replaces the "Coming Soon" placeholder with a functional page that fetches from job_queue and job_events tables via the existing Supabase browser client. Shows status badge, repo link, branch, cost/budget, task description, error details, metadata (test runner, package manager, loops, attempts, worker), and a visual event timeline with per-type icons. Auto-refreshes every 5 seconds while the job is in progress (queued/claimed/running). Links to the PR when the job succeeds.
• Jobs listing page (/jobs): New page showing the 20 most recent jobs in a table with status badges, repo name, truncated task, cost, relative timestamps, and links to detail pages.
• Nav update: Added a "Jobs" link to the landing page and detail page navigation bars.

Technical notes

• Uses the existing createBrowserClient() from @/lib/supabase (anon key, read-only)
• Uses @wright/shared types (Job, JobEvent) and constants (TABLES, JOB_STATUS)
• Simple setInterval polling for MVP (no WebSocket/Realtime subscription)
• TypeScript compiles cleanly (tsc --noEmit passes)

Test plan

• Navigate to /jobs — verify the listing page renders (empty state if no jobs, table if jobs exist)
• Submit a task from /new, follow the "View job status" link — verify the detail page loads
• Verify status badge colors match expected states (queued=slate, claimed=yellow, running=blue, succeeded=green, failed=red)
• Verify auto-refresh while job is in progress (status changes should appear within 5 seconds)
• Verify the PR link button appears when a succeeded job has a pr_url
• Verify error state renders for an invalid job ID (e.g., /jobs/nonexistent)
• Verify the "Jobs" link is visible in the landing page nav bar

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