feat: add session archive/unarchive support to TUI (rebased onto current dev)

[B67687]

Summary

Rebased and refresh of PR #13961 by @uriva onto current dev.

Changes

• /archive slash command to archive current session
• Session list shows archived sessions when toggled with tab
• Selecting an archived session unarchives it
• Auto-navigate home when current session is archived
• session_archive keybind (configurable)

Status

Rebased onto current dev, passes typecheck for changed packages.

Note

Original PR had conflicts due to dev moving forward since the last rebase (Mar 6). This version resolves those conflicts properly.

Closes #13964

Thanks to @uriva for the original implementation

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

Based on the search results, here are the related PRs (excluding the current PR #22328):

Potentially Related PRs:

1. 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
   • This is the original PR that the current PR feat: add session archive/unarchive support to TUI (rebased onto current dev) #22328 is a rebase of. The current PR explicitly states it's "Rebased and refresh of PR feat: add session archive/unarchive support to TUI #13961".

2. PR feat(app): view archived sessions & unarchive #15250 - "feat(app): view archived sessions & unarchive"

   • feat(app): view archived sessions & unarchive #15250
   • Related feature for viewing and unarchiving sessions in the app.

3. PR feat(session): add archive undo + unarchive command #16212 - "feat(session): add archive undo + unarchive command"

   • feat(session): add archive undo + unarchive command #16212
   • Related session archive functionality with undo support.

4. PR fix: --continue should skip archived sessions #22174 - "fix: --continue should skip archived sessions"

   • fix: --continue should skip archived sessions #22174
   • A fix that depends on archive functionality already existing.

Note: PR #22328 is explicitly a rebase of PR #13961 onto current dev, so these are not true duplicates but rather related work on the same feature.

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