M19: Move sidebarCollapsed from localStorage to electron-store

Sidebar collapsed state was an orphan in localStorage -- not backed up,
lost on portable installs, and inconsistent with every other preference.

Added sidebarCollapsed: boolean to the Settings type and DEFAULT_SETTINGS,
wired it through applySettings' boolean branch, and updated the renderer
store / main.tsx mock defaults. App.tsx now drives the toggle via
updateSettings({ sidebarCollapsed }) instead of localStorage.

typecheck + 242 tests + eslint green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/renderer/src/App.tsx

@@ -130,16 +130,9 @@ function App(): React.JSX.Element {
     window.api?.getAppVersion?.().then(setVersion).catch(logError('getAppVersion'))
   }, [])
 
-  // Sidebar collapse, persisted across launches in localStorage.
-  const [collapsed, setCollapsed] = useState(
-    () => localStorage.getItem('aerofetch.sidebarCollapsed') === '1'
-  )
+  const collapsed = useSettings((s) => s.sidebarCollapsed)
   function toggleCollapsed(): void {
-    setCollapsed((c) => {
-      const next = !c
-      localStorage.setItem('aerofetch.sidebarCollapsed', next ? '1' : '0')
-      return next
-    })
+    updateSettings({ sidebarCollapsed: !collapsed })
   }
   // Gate on `loaded` so a returning user's real settings never get clobbered
   // by a one-frame flash of the (default-false) onboarding state.

src/renderer/src/main.tsx

@@ -42,6 +42,7 @@ if (import.meta.env.DEV && !window.api) {
     hasCompletedOnboarding: true,
     minimizeToTray: false,
     launchAtStartup: false,
+    sidebarCollapsed: false,
     updateToken: ''
   }
   // Stands in for the cookies.txt file's mtime — lets the Cookies card's

src/renderer/src/store/settings.ts

@@ -40,6 +40,7 @@ const FALLBACK: Settings = {
   hasCompletedOnboarding: PREVIEW,
   minimizeToTray: false,
   launchAtStartup: false,
+  sidebarCollapsed: false,
   updateToken: ''
 }