fix: #3591876 Fall back to first region when the AI names a region that does not exist

Rajab Natshahrequested to merge
issue/canvas-3591876:3591876-region-fallback into 1.x

Fixes #3591876: the Canvas AI page builder throws Region "%s" not found in layout and discards the whole AI build when the LLM names a region that does not exist on the entity's layout. This falls back to the first available region instead, and only throws when the layout has no regions at all.

AI usage disclosure (per the Drupal AI policy): AI-Generated: Yes. Drafted with AI (Claude) assistance, reviewed and tested by Rajab Natshah.

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Edited by Rajab Natshah

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