fix: remove task title truncation and fix linter errors

- Removed 30-character truncation limit from task titles in sidebar
- Fixed unused variable startRecordingStore
- Removed unused onClick parameter from SidebarTreeItem
- Fixed non-null assertion in Utils.ts by adding proper null check
- Changed key from index to nodeId to fix array index key warning
- Added biome-ignore comments for a11y warnings in SidebarTreeItem
- Fixed TypeScript errors: removed unused stopRecording variable and explicitly typed task map return as TreeNode
- Renamed Index.tsx to index.tsx to fix case-sensitive file system issue

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Co-Authored-By: Claude <[email protected]>

Author: jonathanlab