Session-recovery popup doesn't restore sessions in practice — rework it into a worktree picker

[SmolSmolStar]

Summary

The session-recovery popup shown on restart is confusing and, in practice, doesn't seem to deliver value — reported from a Windows / WebView2 (desktop 0.1.21) mixed-repo workspace with several tiled worktree terminals. This proposes reworking it into a worktree picker.

Current behavior (reported field experience)

1. Unchecking a worktree doesn't remove it from the sidebar. The sidebar is driven by the workspace config, so a deselected worktree still shows up — the checkbox only opts out of restoring that worktree's saved session state, not the worktree itself. To the user, "the popup and the sidebar each do their own thing."
2. Checking a worktree doesn't restore a usable session. After running recovery, the user still has to manually type claude and then /resume in each terminal to get back to work. So the "recover" action doesn't visibly bring back the Claude conversation/terminal.
   • Noting fix: session recovery never resumes conversations (Claude project folder name mismatch + stale session ids) #1004 addressed "session recovery never resumes conversations" — so on this setup it may be incomplete (Windows / mixed-repo project-folder paths), or recovery restores the shell but not the agent session.

Net effect: the popup adds an extra dialog on every restart without a clear payoff, and its checkboxes look like a worktree selector but aren't.

Feature request: make the recovery popup a worktree picker

The model users seem to expect — and what would be genuinely useful — is "choose which worktrees I want loaded this session."

• The popup lists the workspace's worktrees with checkboxes.
• On confirm, the sidebar loads exactly the selected worktrees; deselected ones aren't loaded/shown (removed from the workspace, or hidden until re-added).
• Ideally the selection persists, so the sidebar reflects it on the next restart too.

That turns a confusing, low-value dialog into a per-restart "what am I working on today?" picker that the sidebar actually honors.

Environment

• Agent Workspace 0.1.21 (Windows NSIS build, Tauri / WebView2)
• Mixed-repo workspace, several tiled worktree terminals

Happy to provide more detail on the "doesn't resume" behaviour — e.g. what the recovery snapshot contains vs what the terminal actually shows after recovering.