security: web-vitals & global listeners leak across SPA navigations

[nanaf6203-bit]

Summary

src/lib/mobile-optimizer.ts maintains long-task observers and PerformanceObserver instances attached at module scope, never disposing them; combined with the global addEventListener on window error / unhandledrejection (extensionDetection, earlyErrorSuppression), the app grows listener count across HMR or navigation.

Affected area

• src/lib/mobile-optimizer.ts
• src/utils/extensionDetection.ts
• src/utils/earlyErrorSuppression.ts

Steps to reproduce / impact

Memory growth / listener duplication on SPA route changes is observable in DevTools Performance.

Expected behaviour

Tee observer registration through a per-app lifecycle hook.

Acceptance criteria

• Single observer per app.
• Counters reset in tests.

[Dev-ElvisTobi]

@BigElv has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer I would love to work on this issue please

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[daniel007-ai]

@daniel007-ai has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

trust me on this issue sir

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