feat(analytics): enable low-rate browser Sentry tracing (#2520)

app/src/services/__tests__/analytics.test.ts

@@ -300,9 +300,18 @@ describe('initSentry beforeSend manual-staging bypass', () => {
 
     const opts = hoisted.init.mock.calls[0][0] as {
       release: string;
+      tracesSampler: () => number;
+      replaysSessionSampleRate: number;
+      replaysOnErrorSampleRate: number;
       integrations: Array<{ name?: string }>;
     };
     expect(opts.release).toBe('openhuman@test+abc');
+    hoisted.analyticsEnabled = true;
+    expect(opts.tracesSampler()).toBe(0.1);
+    hoisted.analyticsEnabled = false;
+    expect(opts.tracesSampler()).toBe(0);
+    expect(opts.replaysSessionSampleRate).toBe(0);
+    expect(opts.replaysOnErrorSampleRate).toBe(0);
     const names = opts.integrations.map(i => i.name).filter(Boolean);
     expect(names).toContain('HttpContext');
   });

app/src/services/analytics.ts

@@ -101,7 +101,7 @@ export function initSentry(): void {
     // Privacy: disable EVERYTHING that could leak sensitive state.
     replaysSessionSampleRate: 0,
     replaysOnErrorSampleRate: 0,
-    tracesSampleRate: 0,
+    tracesSampler: () => (isAnalyticsEnabled() ? 0.1 : 0),
     defaultIntegrations: false,
     integrations: [
       Sentry.functionToStringIntegration(),
@@ -191,11 +191,6 @@ export function initSentry(): void {
       return event;
     },
 
-    beforeSendTransaction() {
-      // Block all transactions (performance traces).
-      return null;
-    },
-
     // Ignore common non-actionable errors.
     ignoreErrors: ['ResizeObserver loop', 'Network request failed', 'Load failed', 'AbortError'],
   });