Add analytics tracking for language changes and launcher start events

src/App.tsx

@@ -63,6 +63,7 @@ export function App() {
   const {
     hasAcceptedTermsOfService,
     analyticsConsent,
+    language,
     setAnalyticsConsent,
     shouldShowAnalyticsBanner,
     incrementLaunchCount,
@@ -284,13 +285,14 @@ export function App() {
           os: osInfo.os,
           os_version: osInfo.os_version,
           arch: osInfo.arch,
+          language,
         });
       } catch (error) {
         launcherStartTracked = false;
         console.error('[App] launcher_started tracking failed:', error);
       }
     })();
-  }, [analyticsConsent.decision]);
+  }, [analyticsConsent.decision, language]);
 
   // Fetch notifications when user is logged in
   useEffect(() => {

src/store/useThemeStore.ts

@@ -501,6 +501,9 @@ export const useThemeStore = create<ThemeState>()(
       setLanguage: (lang: SupportedLanguage) => {
         set({ language: lang });
         import("../i18n/i18n").then((mod) => mod.default.changeLanguage(lang));
+        void import("../services/analytics-service").then(({ trackEvent }) => {
+          trackEvent("language_changed", { language: lang }).catch(console.error);
+        });
       },
 
       // Analytics consent functions