feat(electrobun): auto-updater + E2E tests + splash screen — ALL GAPS CLOSED

Auto-updater:
- updater.ts: GitHub Releases API check, semver comparison, timestamp tracking
- AdvancedSettings wired to real updater.check/getVersion RPC

E2E testing (45 tests):
- wdio.conf.js: WebDriverIO config for Electrobun (port 9761)
- fixtures.ts: isolated temp dirs, demo data, git repo init
- 4 spec files: smoke (13), settings (13), terminal (10), agent (9)

Splash screen:
- SplashScreen.svelte: animated gradient AGOR logo, version, loading dots
- App.svelte: shows splash until all init promises resolve, 300ms fade-out

ui-electrobun/src/mainview/App.svelte

@@ -7,6 +7,7 @@
   import NotifDrawer, { type Notification } from './NotifDrawer.svelte';
   import StatusBar from './StatusBar.svelte';
   import SearchOverlay from './SearchOverlay.svelte';
+  import SplashScreen from './SplashScreen.svelte';
   import { themeStore } from './theme-store.svelte.ts';
   import { fontStore } from './font-store.svelte.ts';
   import { keybindingStore } from './keybinding-store.svelte.ts';
@@ -136,6 +137,9 @@
     }).catch(console.error);
   }
 
+  // ── Splash screen ─────────────────────────────────────────────
+  let appReady = $state(false);
+
   // ── Reactive state ─────────────────────────────────────────────
   let settingsOpen = $state(false);
   let paletteOpen  = $state(false);
@@ -276,17 +280,22 @@
 
   // ── Init ───────────────────────────────────────────────────────
   onMount(() => {
-    themeStore.initTheme(appRpc).catch(console.error);
-    fontStore.initFonts(appRpc).catch(console.error);
-    keybindingStore.init(appRpc).catch(console.error);
+    // Run all init tasks in parallel, mark app ready when all complete
+    const initTasks = [
+      themeStore.initTheme(appRpc).catch(console.error),
+      fontStore.initFonts(appRpc).catch(console.error),
+      keybindingStore.init(appRpc).catch(console.error),
+      appRpc.request["groups.list"]({}).then(({ groups: dbGroups }) => {
+        if (dbGroups.length > 0) groups = dbGroups;
+      }).catch(console.error),
+      appRpc.request["settings.get"]({ key: 'active_group' }).then(({ value }) => {
+        if (value && groups.some(g => g.id === value)) activeGroupId = value;
+      }).catch(console.error),
+    ];
 
-    appRpc.request["groups.list"]({}).then(({ groups: dbGroups }) => {
-      if (dbGroups.length > 0) groups = dbGroups;
-    }).catch(console.error);
-
-    appRpc.request["settings.get"]({ key: 'active_group' }).then(({ value }) => {
-      if (value && groups.some(g => g.id === value)) activeGroupId = value;
-    }).catch(console.error);
+    Promise.allSettled(initTasks).then(() => {
+      appReady = true;
+    });
 
     keybindingStore.on('palette',  () => { paletteOpen  = !paletteOpen; });
     keybindingStore.on('settings', () => { settingsOpen = !settingsOpen; });
@@ -316,6 +325,7 @@
   });
 </script>
 
+<SplashScreen ready={appReady} />
 <SettingsDrawer open={settingsOpen} onClose={() => settingsOpen = false} />
 <CommandPalette open={paletteOpen} onClose={() => paletteOpen = false} />
 <SearchOverlay open={searchOpen} onClose={() => searchOpen = false} />