feat(KB-048): add collapsible list sections to dashboard

- Add section expansion state management with localStorage persistence
- Update section headers with chevron toggle controls
- Implement conditional task row rendering based on section state
- Add Expand All / Collapse All toolbar controls
- Add CSS styles for chevron rotation animation and section headers
- Add comprehensive tests for collapsible section behavior

ROADMAP.md

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+# Roadmap
+
+## 🏁 KB-006: Clickable Dependencies
+> Status: completed
+
+- [x] Update TaskCard with clickable dependency badges
+- [x] Pass tasks prop through Column and WorktreeGroup
+- [x] Update TaskDetailModal with clickable dependency links
+- [x] Wire onOpenDetail through to TaskDetailModal
+- [x] Add tests for clickable dependencies
+- [x] Add changeset and documentation