Refine shared Effect idioms

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What Changed

• Replaced DPoP JWT header/payload ad-hoc JSON parsing and record validation with hoisted Effect Schema decoders using Schema.fromJsonString.
• Reworked relay client install-lock retry/staleness handling to use Duration, DateTime.now, Schedule, and a tagged internal retry signal.
• Added focused tests for schema-based DPoP payload rejection and stale install-lock recovery with TestClock.

Why

These changes keep shared runtime code closer to idiomatic Effect patterns: schema-backed parsing, testable Effect time, duration-based policies, and schedule-driven retries without real-time sleeps.

UI Changes

None.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes (not applicable)
• I included a video for animation/interaction changes (not applicable)

  

Note

Refine DPoP JWT validation and install lock acquisition to use Effect idioms

• Replaces manual type guards in dpop.ts with schema-based decoders using Option types, so decoding failures now return specific errors ('Invalid DPoP JWT header.' or 'Invalid DPoP JWT payload.') instead of a generic 'Invalid DPoP proof.'.
• Adds a private JWK material check in header decoding to explicitly reject headers containing private keys.
• Replaces the manual retry loop in relayClient.ts with Effect.retry using a structured Schedule policy, and extracts stale lock detection into tryAcquireInstallLock using DateTime/Duration comparisons.
• Behavioral Change: base64 or JSON decode errors in DPoP proof verification now surface as header/payload-specific errors rather than being caught by the generic catch-all.

^{Macroscope summarized e371cc2.}

[github-actions]

🚀 Expo continuous deployment is ready!

• Project → t3-code
• Platforms → android, ios
• Scheme → t3code-preview

	🤖 Android	🍎 iOS
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