feat: Replace task item icons with clearer state indicators

[charlesvien]

Problem

The sidebar task icons conflated workspace mode (local/worktree) with task state, and the ArrowsSplit worktree icon read as a share icon at small sizes.

Changes

1. Replace BellRinging with HandPalm for permission-needed state
2. Replace Laptop/ArrowsSplit default icons with ChatCircle
3. Replace unread ■ square with filled Circle dot
4. Promote needsPermission to highest priority in the icon chain
5. Remove worktree-specific icons and useFocusStore dependency

How did you test this?

Manually

[charlesvien]

• feat: Add bulk archive and clean up task context menu #1622
• fix: Drag-and-drop file attach broken #1620
• fix: Several small issues reported by Cory #1619
• feat: Replace task item icons with clearer state indicators #1613 👈 (View in Graphite)
• main

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[charlesvien]

Merge activity

• Apr 13, 7:31 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Apr 13, 7:31 PM UTC: @charlesvien merged this pull request with Graphite.