feat(electrobun): wire EVERYTHING — all settings persist, theme editor, marketplace

All settings wired to SQLite persistence:
- AgentSettings: shell, CWD, permissions, providers (JSON blob)
- SecuritySettings: branch policies (JSON array)
- ProjectSettings: per-project via setProject RPC
- OrchestrationSettings: wake, anchors, notifications
- AdvancedSettings: logging, OTLP, plugins, import/export JSON

Theme Editor:
- 26 color pickers (14 Accents + 12 Neutrals)
- Live CSS var preview as you pick colors
- Save custom theme to SQLite, cancel reverts
- Import/export theme as JSON
- Custom themes in dropdown with delete button

Extensions Marketplace:
- 8-plugin demo catalog (Browse/Installed tabs)
- Search/filter by name or tag
- Install/uninstall with SQLite persistence
- Plugin cards with emoji icons, tags, version

Terminal font hot-swap:
- fontStore.onTermFontChange() → xterm.js options update + fitAddon.fit()
- Resize notification to PTY daemon after font change

All 7 settings categories functional. Every control persists and takes effect.

ui-electrobun/tsconfig.json

@@ -13,7 +13,8 @@
 		"noUnusedLocals": true,
 		"noUnusedParameters": true,
 		"noFallthroughCasesInSwitch": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"allowImportingTsExtensions": true
 	},
 	"include": ["src"],
 	"exclude": ["node_modules", "dist", "build", "../../package/dist"]