v0.22.0

What's New

• Brume theme — new theme with shared semantic classes in base.css
• Variable browser — new viewdef and debug page for inspecting UI state
• MCP server refactor — extracted theme logic to theme.go, slimmed down server.go
• Theme updates — clarity, lcars, midnight, ninja all use semantic classes now
• Simplified viewdefs — app-console and claude-panel cleaned up
• Prefs & tutorial rework — improved preferences app and tutorial system
• CSS variables — new variables support for MCP app