v0.2.1

Activity Stream Fixes & Code Quality

Bug Fixes

• Animation jank: Removed index-based stagger delay that caused frame drops on large streams
• Scroll scheduling: Replaced setTimeout(0) with requestAnimationFrame for smoother auto-scroll
• New-item detection: Switched from length-based to ID-based tracking (fixes false positives on entry replacement)
• Memory leak: Fixed seenIdsRef unbounded growth — now caps at 2000 and rebuilds
• Render allocation: Fixed useRef initializer allocating a new Set on every render via lazy init pattern
• Test coverage gap: Shared tests (src/shared/) were silently excluded from bun test — now included (307 tests, up from 216)

Improvements

• Error pipeline: End-to-end error extraction from part files → PartMeta.error → ToolCallSummary.error → BurstRow inline display
• BurstRow redesign: Agent name label restored, latest action as primary text, tool breakdown dimmed, inline error count + preview
• Type safety: Narrowed MilestoneEntry union (removed dead ToolCallActivity path), added isMilestone() type guard
• Dead code cleanup: Removed unreachable tool-call milestone branches in MilestoneRow and AgentSwimlane
• ES2023: Bumped lib target for Array.findLast() support

Tests

• 307 server/shared tests passing
• 176 client tests passing
• 0 TypeScript errors