Three changes to fix the immediate-logout issue reported by multiple
Docker users:
1. Add explicit `credentials: 'same-origin'` to the login fetch call.
This was the only fetch in the entire codebase missing it. While
modern browsers default to 'same-origin', some privacy configs or
older engines may default to 'omit', silently dropping Set-Cookie
headers from the login response.
2. Post-login cookie verification: after a successful login, the
frontend now checks that the CSRF cookie (non-HttpOnly, readable
by JS) was actually stored before redirecting. If the browser
rejected the cookies, a clear error message is shown explaining
the OXICLOUD_COOKIE_SECURE / HTTP mismatch.
3. Server-side diagnostic: the login handler now warns in logs when
Secure cookies are set on a request that didn't arrive via HTTPS
(no X-Forwarded-Proto: https header), pointing admins to the
OXICLOUD_COOKIE_SECURE=false fix.
Root cause: users who set OXICLOUD_BASE_URL=https://... (or have
OXICLOUD_COOKIE_SECURE=true) but access via plain HTTP get cookies
with the Secure flag, which browsers silently reject over HTTP.
Diocrafts
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