feat(settings): bulk select and actions for archived threads

[adityavardhansharma]

What Changed

• Settings → Archive: archived threads support multi-select (checkbox per row).
• Select all: tri-state checkbox to select or clear all archived threads at once.
• Bulk unarchive: Unarchive (N) runs unarchive for every selected thread (N = selection count).
• Bulk delete: Delete (N) deletes every selected thread (N = selection count), with the same bulk worktree / deletedThreadIds behavior as multi-delete elsewhere.
• When “confirm before deleting threads” is on, bulk delete uses the in-app AlertDialog instead of window.confirm. When it’s off, bulk delete runs immediately with no modal.

Why

• Makes it practical to unarchive or delete many archived threads at once.

UI Changes

Before

After

Video

t3_code.mp4

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Medium Risk
Adds new bulk delete/unarchive flows in the settings archive panel, increasing the chance of accidental destructive actions or edge cases around selection/state and repeated deletes. Uses existing deleteThread behavior (including worktree prompts) but now executed in a loop, so reviewers should sanity-check UX and error handling.

Overview
Adds multi-select to ArchivedThreadsPanel via per-row checkboxes plus a tri-state Select all control, and introduces a small toolbar showing Unarchive (N) and Delete (N) actions for the current selection.

Implements bulk unarchive and bulk delete by iterating selected thread IDs, reusing deleteThread(..., { deletedThreadIds }) for consistent multi-delete/worktree behavior, and pruning selection when the archived list changes.

Bulk delete now respects confirmThreadDelete: when enabled it shows an in-app AlertDialog confirmation; when disabled it deletes immediately, with toast errors surfaced per-thread.

^{Written by Cursor Bugbot for commit c44be35. This will update automatically on new commits. Configure here.}

Note

Add bulk select and delete/unarchive actions for archived threads in settings

• Adds checkboxes to each archived thread row in ArchivedThreadsPanel (SettingsPanels.tsx), along with a 'Select all' checkbox and bulk action buttons for unarchive and delete.
• Bulk delete respects the appSettings.confirmThreadDelete flag: when enabled, it prompts an AlertDialog confirmation before proceeding.
• Selection state is kept in sync with the archived threads list via useMemo/useEffect, so removed threads are automatically deselected.

^{Macroscope summarized c44be35.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature for bulk selecting and deleting/unarchiving threads. New workflows and capabilities like bulk permanent deletion warrant human review regardless of implementation quality.

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