fix(react): restore uiProfiler on curated @sentry/react exports

uiProfiler was part of the public @sentry/browser exports re-exported via
export * from @sentry/react. The curated browser-api list omitted it, which
would break import { uiProfiler } from '@sentry/react' (and framework SDKs
that re-export the React surface).

Author: anonrig

packages/react/src/browser-api.ts

@@ -94,6 +94,10 @@ export {
   opera11StackLineParser,
   winjsStackLineParser,
   makeFetchTransport,
+  // Manual UI profiling API (pairs with browserProfilingIntegration from
+  // optional-browser-api / @sentry/browser). Was on the pre-curation public
+  // surface via export * from @sentry/browser.
+  uiProfiler,
   // Scope helpers
   metrics,
   onLoad,

packages/react/test/exports.treeshake.test.ts

@@ -21,6 +21,10 @@ describe('@sentry/react export surface (tree-shaking)', () => {
     expect(typeof SentryReact.thirdPartyErrorFilterIntegration).toBe('function');
     expect(typeof SentryReact.ErrorBoundary).toBe('function');
     expect(typeof SentryReact.reactErrorHandler).toBe('function');
+    // Public API previously re-exported via export * from @sentry/browser
+    expect(SentryReact.uiProfiler).toBeDefined();
+    expect(typeof SentryReact.uiProfiler.startProfiler).toBe('function');
+    expect(typeof SentryReact.uiProfiler.stopProfiler).toBe('function');
   });
 
   it('does not export optional heavy browser features from the root entry', () => {