feat(releases): hierarchical tree view for Big Rocks dashboard

[dimakis]

Summary

• Adds a Table/Tree view toggle to the Big Rocks dashboard page
• BigRocksTree.vue: work-graph-style hierarchy (Rock > Features) with expand/collapse, status-colored dots, connector lines, and size indicators
• SizeIndicator.vue: mini completion bar + epic/item counts + optional RICE score badge
• useHealthAggregation.js: projects epicCount, issueCount, rice, storyPoints into rockFeatures; aggregates totalEpicCount, totalIssueCount, totalStoryPoints into rockHealth
• 492 tests passing (including 24 new tests for tree + size indicator + aggregation)

Test plan

• Load Big Rocks page, verify Table view unchanged
• Toggle to Tree view, verify rocks render with expand/collapse
• Expand rocks, verify features show with status dots and size indicators
• Expand All / Collapse All buttons work
• Edit/Delete actions still function from tree view
• Verify dark mode styling

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