Add configurable web-extension session uploads

[Juice10]

Summary

• add explicit uploads for selected saved extension sessions to https://api.rrweb.com
• add locally stored, configurable API base URL and bearer token settings with safe recovery and HTTPS guidance
• send NDJSON with Brotli/gzip/raw fallbacks, stable per-session results, and a 30-second request timeout
• add focused unit/component coverage and document the endpoint and CORS contract

Scope

Recordings remain local until the user selects them and clicks Upload. This PR intentionally does not add automatic recording startup or a page/session-ID bridge; those belong in a separate PR.

Validation

• 48 web-extension unit/component tests
• dependency-aware typecheck: 10/10 tasks with cache bypassed
• Chrome production build
• Firefox production build
• Prettier and diff checks
• credential/endpoint hygiene scan

@eoghanmurray, would you take a look when you have a chance?

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Latest commit: 907b535

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