feat(core-analytics): add React provider and useAnalytics hook

Adds a ./react subpath export to @repo/core-analytics containing
<AnalyticsProvider value={IAnalytics}> and useAnalytics(): IAnalytics.
useAnalytics() throws AnalyticsContextError when called outside a provider.
React Testing Library test verifies track() flows through context using
RecordingAnalytics. Switches vitest config to pick up .tsx test files
via environmentMatchGlobs and extends tsconfig to react-library.json
for JSX support.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -430,9 +430,21 @@ importers:
       "@repo/core-typescript":
         specifier: workspace:*
         version: link:../core-typescript
+      "@testing-library/react":
+        specifier: ^16.0.0
+        version: 16.3.2(@testing-library/dom@10.4.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      "@types/react":
+        specifier: ^19.0.0
+        version: 19.2.14
       "@vitest/coverage-v8":
         specifier: ^3.0.0
         version: 3.2.4(vitest@3.2.4(@types/debug@4.1.13)(@types/node@25.5.2)(happy-dom@20.8.9)(jiti@2.6.1)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0))
+      jsdom:
+        specifier: ^25.0.0
+        version: 25.0.1
+      react:
+        specifier: ^19.0.0
+        version: 19.2.4
       typescript:
         specifier: ^5.8.0
         version: 5.9.3