feat(app): view archived sessions & unarchive

[alexyaroshuk]

Issue for this PR

Closes #6680, #12393

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds a new "Archived Sessions" section in Settings that allows users to:

• View all archived sessions across projects (or filtered to current project)
• Restore (unarchive) any archived session back to the sidebar

How did you verify your code works?

1. bun test
2. manual test:

• able to view archived sessions for current project
• able to view archived sessions for all projects
• when a session is unarchived, the archived session list is rebuilt, and the session list in the sidebar-items is rebuilt as well (we now see this session as if it was not archived)
• when a session is archived, the archived session list is rebuilt

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

Comparison to #6769

This pr solves the same underlying issue as 6769, but differently:
Compared to PR #6769, I've placed the archived sessions feature in Settings/ Data(new tab) instead of the sidebar dropdown, added a multi-project filter (All/Current project), and used a simpler list view without the built-in search. The backend changes are in routes/session.ts instead of server.ts.

Files changed

Files	Changes
packages/app/src/components/settings-archive.tsx	New component to view/restore archived sessions
packages/app/src/components/dialog-settings.tsx	Added Archived Sessions tab in Data section
packages/opencode/src/server/routes/session.ts	Added archived filter param, nullable archived for unarchive
packages/opencode/src/session/index.ts	Added archived filter in list query, setArchived accepts null
packages/app/src/i18n/*.ts	Added related keys

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate PRs Found

1. PR Feat/view archived sessions #6769: Feat/view archived sessions

   • Feat/view archived sessions #6769
   • This is directly mentioned in the current PR's comparison section. It addresses the same underlying issues ([FEATURE]: view archived sessions on desktop #6680, How to unarchive in opencode-desktop #12393) but with a different implementation approach (sidebar dropdown vs Settings tab).

2. PR feat: add session archive/unarchive support to TUI #13961: feat: add session archive/unarchive support to TUI

   • feat: add session archive/unarchive support to TUI #13961
   • Related archive/unarchive functionality, though focused on TUI rather than the main app UI.

3. PR feat(app): temporarily disable archive session button and command #12020: feat(app): temporarily disable archive session button and command

   • feat(app): temporarily disable archive session button and command #12020
   • Related to session archiving functionality and may need to be reconsidered with this new feature.

[alexyaroshuk]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate PRs Found

1. PR Feat/view archived sessions #6769: Feat/view archived sessions

   • Feat/view archived sessions #6769
   • This is directly mentioned in the current PR's comparison section. It addresses the same underlying issues ([FEATURE]: view archived sessions on desktop #6680, How to unarchive in opencode-desktop #12393) but with a different implementation approach (sidebar dropdown vs Settings tab).

2. PR feat: add session archive/unarchive support to TUI #13961: feat: add session archive/unarchive support to TUI

   • feat: add session archive/unarchive support to TUI #13961
   • Related archive/unarchive functionality, though focused on TUI rather than the main app UI.

3. PR feat(app): temporarily disable archive session button and command #12020: feat(app): temporarily disable archive session button and command

   • feat(app): temporarily disable archive session button and command #12020
   • Related to session archiving functionality and may need to be reconsidered with this new feature.

1. addressed above, slightly different implementation - not a duplicate
2. tui change, not quite related to desktop
3. 12020 is a bandaid change, unrelated