refactor: unify API error types

[jc1788-byte]

Summary

• add a single shared ApiError contract under src/lib/error.ts
• normalize nested API payloads into the same shape across services
• cover the behavior with a focused Vitest regression test
• fix malformed WebAuthn endpoint strings encountered while validating the refactor

Closes #415

Verification

• npx vitest run src/lib/error.test.ts

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[sshdopey]

Great work on unifying the API error types! The shared ApiError class and normalizeApiError helper look solid, and the tests cover the key cases. Also nice catch fixing those malformed WebAuthn endpoint strings. This directly addresses issue #415. Keep it up! ❤️

[sshdopey]

Approved! 🎉 I couldn't auto-merge this just yet (it may need a rebase or have a check still running). A maintainer can merge it whenever it's ready.

[sshdopey]

This is a solid step toward unifying API error types across the codebase. The new ApiError class, normalization helpers, and tests directly address the issue's goal of a shared error contract. The extra WebAuthn fix is a nice bonus. Great work! Keep it up! ❤️

[sshdopey]

Approved! 🎉 I couldn't auto-merge this just yet (it may need a rebase or have a check still running). A maintainer can merge it whenever it's ready.