Dashboard statistics tab in right panel

[waleedkadous]

Feature Request

Add a Statistics tab to the dashboard right-hand panel showing key project health metrics:

Proposed Metrics

• PRs submitted — count over last 7 days (from GitHub API)
• Average wall clock time — for bug fixes (time from issue creation to PR merge)
• Average agent time — builder session duration for bugs
• Bug backlog size — count of open issues with bug label
• Feature backlog size — count of open issues without bug label
• Builder throughput — projects completed per day/week

UX

• New tab in the right-hand panel alongside existing tabs
• Data refreshes on tab activation
• Compact display with sparklines or simple numbers
• Time range selector (7d / 30d / all)

Data Sources

• GitHub Issues API (backlog counts, time-to-close)
• GitHub PRs API (PR counts, merge times)
• Porch project state files (builder session durations)
• consult stats metrics DB (consultation costs)

[waleedkadous]

Scope update: Issue #460 (Consultation stats in workspace dashboard) has been merged into this issue. Please include consultation metrics in the statistics tab: total consultations by model, cost breakdown, average latency, verdict distribution, cost per project, and trend charts. Data sources: ~/.codev/metrics.db and af bench results.