feat: Add bulk archive and clean up task context menu

[charlesvien]

Problem

Archiving old tasks one at a time is tedious and the context menu had disorganized grouping with incorrect suspend visibility.

Changes

1. Add "Archive prior tasks" context menu action that archives all tasks older than the clicked one
2. Extract archiveTaskImperative for reuse outside React hooks
3. Reorganize context menu: quick actions on top, workspace actions in middle, archive at bottom
4. Fix Suspend showing for non-worktree tasks (was incorrectly using folderPath fallback)
5. Toggle Suspend/Unsuspend label based on task state
6. Remove Delete from context menu in favor of archiving

How did you test this?

Manually

[charlesvien]

• feat: Add bulk archive and clean up task context menu #1622 👈 (View in Graphite)
• 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
• main

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[adboio]

nit, and not super related to this PR, but do we need "copy path" in that context menu?

also for "open in cursor" vs. "open in..." is cursor just a default we chose, or are we doing anything clever (here and in the open file button) with the user's last-used app?

[charlesvien]

Merge activity

• Apr 13, 9:40 PM UTC: @charlesvien merged this pull request with Graphite.

[charlesvien]

nit, and not super related to this PR, but do we need "copy path" in that context menu?

also for "open in cursor" vs. "open in..." is cursor just a default we chose, or are we doing anything clever (here and in the open file button) with the user's last-used app?

Good points. I'll throw these into the onboarding PR, had auto-merge on for this one