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/src/mainview/settings/ProjectSettings.svelte

@@ -1,4 +1,6 @@
 <script lang="ts">
+  import { onMount } from 'svelte';
+  import { appRpc } from '../main.ts';
   import { PROVIDER_CAPABILITIES, type ProviderId } from '../provider-capabilities';
 
   const ANCHOR_SCALES = ['small', 'medium', 'large', 'full'] as const;
@@ -6,7 +8,6 @@
 
   const PROVIDERS = Object.keys(PROVIDER_CAPABILITIES) as ProviderId[];
 
-  // Demo projects
   interface ProjectConfig {
     id: string;
     name: string;
@@ -21,26 +22,12 @@
 
   let projects = $state<ProjectConfig[]>([
     {
-      id: 'p1',
-      name: 'agent-orchestrator',
-      provider: 'claude',
-      model: 'claude-opus-4-5',
-      useWorktrees: false,
-      useSandbox: false,
-      stallThreshold: 15,
-      anchorScale: 'medium',
-      customContext: '',
+      id: 'p1', name: 'agent-orchestrator', provider: 'claude', model: 'claude-opus-4-5',
+      useWorktrees: false, useSandbox: false, stallThreshold: 15, anchorScale: 'medium', customContext: '',
     },
     {
-      id: 'p2',
-      name: 'quanta-discord-bot',
-      provider: 'claude',
-      model: 'claude-sonnet-4-5',
-      useWorktrees: false,
-      useSandbox: false,
-      stallThreshold: 15,
-      anchorScale: 'medium',
-      customContext: '',
+      id: 'p2', name: 'quanta-discord-bot', provider: 'claude', model: 'claude-sonnet-4-5',
+      useWorktrees: false, useSandbox: false, stallThreshold: 15, anchorScale: 'medium', customContext: '',
     },
   ]);
 
@@ -49,11 +36,26 @@
 
   function updateProj(patch: Partial<ProjectConfig>) {
     projects = projects.map(p => p.id === selectedId ? { ...p, ...patch } : p);
+    const updated = projects.find(p => p.id === selectedId)!;
+    appRpc?.request['settings.setProject']({
+      id: selectedId,
+      config: JSON.stringify(updated),
+    }).catch(console.error);
   }
+
+  onMount(async () => {
+    if (!appRpc) return;
+    const res = await appRpc.request['settings.getProjects']({}).catch(() => ({ projects: [] }));
+    if (res.projects.length > 0) {
+      const loaded: ProjectConfig[] = res.projects.flatMap(({ config }) => {
+        try { return [JSON.parse(config) as ProjectConfig]; } catch { return []; }
+      });
+      if (loaded.length > 0) projects = loaded;
+    }
+  });
 </script>
 
 <div class="section">
-  <!-- Project selector -->
   <h3 class="sh">Project</h3>
   <div class="proj-tabs">
     {#each projects as p}