[Feature]: Bulk delete archived threads

[pjmuller]

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

apps/web

Problem or use case

The Archive settings page only exposes permanent deletion through a hidden per-row right-click menu. With dozens or hundreds of archived threads, clearing old history requires repeating the same destructive action one thread at a time. There is no supported bulk cleanup path.

Proposed solution

Add multi-select to Settings → Archive with Select all and Delete selected actions. Keep deletion explicitly permanent, show the exact selected count in a confirmation dialog, and report partial failures without losing the remaining selection. Selection/action identity should be scoped by environment and thread ID.

Why this matters

Long-lived installations accumulate many archived threads and a large local SQLite database. A supported bulk action makes routine privacy and storage cleanup practical without unsupported manual database editing.

Smallest useful scope

Checkboxes per archived row, Select all, and Delete selected with one count-aware confirmation. Per-project or search-filtered bulk actions can follow later.

Alternatives considered

Delete each archived row via its right-click menu; delete projects; or manually edit state.sqlite. The first is too slow at scale, project deletion is too broad, and direct SQLite editing is unsafe/unsupported.

Risks or tradeoffs

Permanent deletion is destructive and cleanup may partially fail, especially when worktrees are involved. Require explicit confirmation, preserve failed selections, and summarize successes/failures.

Examples or references

Related prior work: #3615 and #3552 proposed archive bulk actions but were closed without merge. #5550 tracks broader SQLite retention/compaction.

Contribution

• I would be open to helping implement this.