[codex] Structure missing client cloud config errors

[juliusmarminge]

Summary

• replace generic missing Clerk JWT template throws in web and mobile with Schema-tagged configuration errors
• carry the missing public configuration key as structured data while preserving the existing message
• avoid inventing a cause for a deterministic configuration validation failure
• cover both client boundaries with focused tests

Validation

• pnpm vp test apps/web/src/cloud/publicConfig.test.ts apps/mobile/src/features/cloud/publicConfig.test.ts (9 tests)
• pnpm vp check (passes with existing repository warnings)
• pnpm vp run typecheck
• pnpm vp run lint:mobile

Note

Replace generic errors with structured CloudPublicConfigMissingError in web and mobile cloud config

Introduces CloudPublicConfigMissingError, a tagged error class (via effect/Schema), in both the web and mobile publicConfig modules. When resolveRelayClerkTokenOptions cannot find the Clerk JWT template, it now throws this structured error instead of a plain Error. Tests are added for both platforms to verify the new error type is thrown.

^{Macroscope summarized adbdcc0.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/web-cloud-config-error

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[macroscopeapp]

Approvability

Verdict: Approved

This PR replaces generic Error throws with a structured CloudPublicConfigMissingError class in two locations. The error condition and message remain unchanged - this is purely a typing/structure improvement with added tests, carrying minimal risk.

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Dismissing prior approval to re-evaluate adbdcc0