Agent Count, Quick Jump Refresh & Image Paste

Features

• Show active agent count in the top bar
• Refreshed worktree quick jump UI (Cmd+J)

Improvements

• Redesigned agent list with cleaner layout

Fixes

• Warp-parity keyboard shortcuts — image paste and line-kill bindings now work correctly
• Intercept Cmd+V at keydown level so image paste works in the terminal