J3: Session replay on failed tx flows only

[Dgetsylver]

Scope
Consented, privacy-scrubbed session replay (e.g., PostHog) that only captures when an error boundary fires on a tx flow. Helps diagnose edge cases.

Acceptance

• Explicit user consent required.
• PII masked (input fields, wallet addresses).
• Off by default, opt-in via settings.

Files
frontend/src/main.ts

[heymide]

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[drips-wave]

This issue has been completed by @heymide as part of the Stellar Wave Program's 5th Wave 🥳

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