feat: computer use, session/workspace tooling, and remote SSH integration by bobleer · Pull Request #261

feat: computer use, session/workspace tooling, and remote SSH integration by bobleer · Pull Request #261 · GCWing/BitFun

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- Add computer_use agent tool with desktop host (capture, pointer assets)
- Plumb tool image attachments through AI message converters and persistence
- Desktop APIs: computer_use, session storage path; server/bootstrap wiring
- Remote SSH workspace and flow chat session ordering/metadata updates
- Web UI: session config, workspace manager, Nav recent-workspace display
- Fix openMainSession activateWorkspace typing for Promise<WorkspaceInfo>
- Resolve MainNav with upstream (search, project session helpers, recent labels)