Tree-shake long task/LoAF tracking; fix default doc #26138

browserTracingIntegration() always bundles long task and long animation frame tracking. enableLongTask and enableLongAnimationFrame are runtime booleans, so bundlers can't drop the code.

• The calls to startTrackingLongAnimationFrames() / startTrackingLongTasks() sit behind runtime checks in browserTracingIntegration.ts L436–L445.
• Measured on a tracing-only setup (BrowserClient + browserTracingIntegration(), esbuild 0.27, minified ESM, __SENTRY_DEBUG__: false): this code is about 1.2 KB raw / 380 B brotli-11.
• The enableLongAnimationFrame JSDoc says Default: false (L130), but the actual default is true (L284).

via @BYK.

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