Adds a regression suite for #3843 so the leak cannot return silently. The
client had no test runner, so this introduces Vitest, which reuses the
existing Vite resolution and the `@/` alias rather than needing a separate
transform pipeline. jsdom is required because the logger reads
window.location and navigator.userAgent.
The tests drive the exported `logger` rather than the private redaction
helpers, so they cover the wiring as well as the logic. That distinction
matters here: the first attempt at this fix redacted the JSON branch but
left the debug branch printing raw objects, a gap that testing the helper
in isolation would not have caught. Each case runs at both error and debug
level for the same reason.
Covered: the reported login payload, credentials carried on an AxiosError
(config.data and the Authorization header), non-JSON request bodies,
passwords on class instances, key-matching variants, and circular payloads.
One asserts non-sensitive context survives, so redaction cannot regress
into blanket suppression.
Verified by reverting the fix: 16 of 23 tests fail against the original
behaviour, including a pre-existing crash on circular payloads.
gorkem-bwl
ed268b3099