fix(api-rdi): align fallback status checks with Axios error format

[AleksaMCode]

What

Updated RDI error handling to align with real Axios error objects.

Docs:

• https://axios.rest/pages/advanced/error-handling#handling-errors
• https://axios.rest/pages/getting-started/examples/typescript#typing-errors

Testing

• Updated/validated unit test expectations to reflect Axios-shaped errors (response.status) for these flows.

---

Note

Low Risk
Narrow error-handling fix in the RDI HTTP client; restores intended dev-login and legacy-RDI 405 behavior without broader API changes.

Overview
RDI API client fallback paths that depend on HTTP status now read response.status on real Axios errors instead of a top-level status field, using axios.isAxiosError before branching.

Login: A 404 on /login still triggers dev-mode dummy JWT auth, but only when the rejection is an Axios error with response.status === NOT_FOUND.

Test source connections: 405 still maps to the “upgrade to 1.6.0+” message for older RDI; other failures still get the generic connection error. Catch typing moves from any to unknown.

Tests: The axiosError helper and dev-login mock rejections are shaped like Axios errors (isAxiosError, response.status), and isAxiosError is stubbed in beforeEach so unit tests match production checks.

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