[FEATURE]: Surface recent directories in the existing /move picker

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

The existing /move picker already knows project directories and session subdirectories. I would like it to surface a small Recent group derived from existing session metadata, so switching back to recently used directories inside the current project does not require hunting through the full list.

Proposed scope:

• reuse existing session/project directory data; no new persistence
• same-project only
• exclude the current directory and deduplicate paths
• keep the existing moveSession flow unchanged
• keep the TUI SDK-only / remote-safe
• no new slash command

Rough UX:

Move session

Current
  ~/code/project

Recent
  ~/code/project/backend
  ~/code/project/agent-runtime

Other
  ~/code/project/worktree-a

I recently implemented the same recent-directory picker idea in Oh My Pi (can1357/oh-my-pi#12497), where it made repeated project navigation much faster on Windows/PowerShell.

I am not proposing to copy that implementation here. OpenCode already has a more complete move-session architecture, so this would only change how destinations are surfaced.

Related but different:

• #8541 proposed directory navigation inside the session dialog
• #43223 proposes a new /cd command/tool
• this request only enhances the existing /move picker

If the core team likes the UX, I can prepare a small implementation after design approval.

Start by locating the existing /move picker, its session/project directory metadata, and the moveSession flow. Confirm how destinations are currently surfaced and keep the change within the existing TUI SDK-only, remote-safe path. Done means a same-project Recent group excludes the current directory, deduplicates paths, reuses existing metadata, and leaves the move flow unchanged.