* fix(settings): preserve OpenAI form input on validation failure
Fixes#1824.
The OpenAI settings form auto-submits on blur, so typing the URI base
before the model triggers cross-field validation. The rescue re-renders
the page with values read from Setting.openai_*, which is still blank
because the failed save was rejected — so the user's input disappears
and they see 'OpenAI model is required' with no value to fix.
Stash the submitted uri_base and model on rescue and prefer them over
the saved Setting when rendering, so the user can finish typing the
missing field and re-submit.
* test(settings): cover openai_model preservation on validation fail (#1862)
jjmata asked for symmetric coverage of the model field. Add a test where
the user changes the URI base and clears the model in the same submit:
the cross-field validation fails and the re-rendered model input must
reflect the submitted (cleared) value rather than reverting to the saved
model. Complements the existing uri_base preservation test.
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