feat: Review Stacks の色段階を Inventory チャートと統一する

[coji]

Summary

• AGE_THRESHOLDS を 4 段階から 6 段階に拡張し、Inventory チャート (Open PRの滞留日数分布チャート - 見えない在庫を可視化する #253) と同じ色段階に統一
• team-stacks-chart.tsx の凡例は AGE_THRESHOLDS.map で描画しているため自動追従

Changes

段階	日数	色 (before)	色 (after)
1	< 1d	emerald	blue
2	1-3d	blue	emerald
3	3-7d	amber	amber
4	7-14d	—	red
5	14-30d	—	purple
6	31d+	red (was 7d+)	neutral-800

Test plan

• pnpm validate が通る
• Review Stacks の age モードで 6 色段階の凡例が表示される
• PR ブロックの色が経過日数に応じて正しく変わる
• Inventory チャートと色の対応が一致している

Closes #258

Generated with spec-implement-accept skill

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9a5da6e0-64d5-475e-9558-4f3df7b9a736

📥 Commits

Reviewing files that changed from the base of the PR and between ca81d7f and c294149.

📒 Files selected for processing (2)

• app/routes/$orgSlug/+components/pr-block.tsx
• app/routes/$orgSlug/workload/+components/team-stacks-chart.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/258-review-stacks-color-unify

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