Add mobile remote desktop sessions

[ZacharyZcR]

Overview

Add mobile remote desktop sessions so RDP, VNC, and Telnet hosts can be launched from the mobile Hosts tab through the existing Guacamole backend.

• Added: mobile Remote Desktop session backed by Guacamole WebSocket connections
• Updated: Hosts list to include non-SSH remote desktop hosts
• Updated: session handling to support remote desktop tabs
• Added: touch mouse scaling and basic keyboard/special-key controls
• Added: viewport resize forwarding and scrollable control bar for small screens

Changes Made

• Reuse /guacamole/connect-host/{hostId} to generate a host-scoped Guacamole token.
• Connect the mobile WebView client to /guacamole/websocket/ with viewport dimensions.
• Add a RemoteDesktop session renderer with connection, disconnect, error, and reconnect states.
• Route RDP/VNC/Telnet hosts to remote desktop sessions from the Hosts list and context menu.
• Add mobile input controls for text entry, Esc, Tab, Enter, Backspace, arrow keys, and Ctrl+Alt+Del.
• Correct touch coordinates when the Guacamole display is scaled to fit the phone screen.
• Forward viewport resize events to Guacamole so rotation can update the remote display without reconnecting.
• Keep the remote desktop toolbar horizontally scrollable to avoid cramped small-screen layouts.

Related Issues

• Closes [FEATURE] RDP support to mobile app Support#566

Screenshots / Demos

Not included; this needs a configured Termix server with guacd and an RDP/VNC/Telnet host to verify interactively on device.

Validation run locally:

• npx eslint app/tabs/sessions/remote-desktop/RemoteDesktop.tsx passes.
• npx prettier --check app/tabs/sessions/remote-desktop/RemoteDesktop.tsx passes.
• git diff --check passes.
• npx eslint app/main-axios.ts app/contexts/TerminalSessionsContext.tsx app/tabs/hosts/Hosts.tsx app/tabs/hosts/navigation/Host.tsx app/tabs/sessions/Sessions.tsx app/tabs/sessions/navigation/TabBar.tsx app/tabs/sessions/remote-desktop/RemoteDesktop.tsx passes with existing warnings only.
• npx tsc --noEmit still fails on existing repository-wide TypeScript errors outside this change.

Checklist

• Code follows project style guidelines
• Supports mobile and desktop UI/app (if applicable)
• I have read Contributing.md