Feature request: Desktop GUI client (Tauri/Electron) alongside the browser Web UI

[luoxh8]

Summary

Provide an optional native desktop GUI client (Tauri or Electron shell) for DeepSeek Harness, so users can run the Web UI in a native window instead of a browser tab, with system tray, auto-start, global shortcuts, and desktop notifications.

Background

I currently run dsh web and keep the browser tab open at http://127.0.0.1:3080. A desktop shell would give a Codex-Desktop-like experience: native window, tray residency, notifications, and better background session management (closing the window should not kill agent sessions).

Acceptance criteria

1. A command such as dsh desktop (or equivalent) launches a native window loading the existing Web UI, without manually opening a browser
2. Closing the window minimizes to system tray; agent sessions keep running in the background
3. Desktop notifications on task completion or when approval is needed
4. All existing Web UI capabilities preserved: agent presets (Standard / PTC / Minimal / Creator), goals, subagents, workflows
5. Works on Windows at minimum; Linux/macOS as stretch

User-visible change

• Native window + tray residency + notifications instead of a browser tab
• No need to remember the localhost URL
• More natural background session management

Test evidence (proposed)

• Verify Tauri/Electron shell loads the Web UI on Windows, tray and notifications work
• Regression test that existing Web UI features are unaffected

(Submitted on behalf of a user who prefers desktop GUI over browser Web UI.)