v3.1.0 — Desktop-feel pass

Highlights

• Window manager: resize handles, maximize/restore polish, Ctrl+Tab cycling, classic context menus, sticky icon positions
• Explorer: safer Markdown/code/image previews, folder filter, consistent Open/Preview
• Controls (opt-in, default off): allowlisted systemd + Docker start/stop/restart (allow_service_control / allow_docker_control)
• Tray: temp, clearer meters, disk free snippet

Security

Service/Docker controls stay disabled until you flip the config flags. APIs use fixed argv and strict allowlists — no arbitrary shell from the UI.

Full notes: CHANGELOG.md