v2.0.0 — GTK/GNOME Desktop Widget

[danielithomas]

Summary

GTK4/libadwaita desktop application with system tray indicator.

Key deliverables

• GTK4 + libadwaita application (--ux mode)
• System tray indicator with aggregate status icon
• Per-provider collapsible sections in popover
• Theme-aware (dark/light via libadwaita)
• XDG autostart via .desktop file
• KDE Plasma compatibility (StatusNotifierItem protocol)
• Extra usage spend display (if APIs become available)
• README update with GTK desktop widget documentation

Requires [gtk] extra: uv tool install "llm-monitor[gtk]"

See docs/SPEC.md Section 14, v2.0.0 for full checklist.