Tranquil-Flow 4e56eacdce fix(vision): reject oversized images before API call, handle file:// URIs, improve 400 errors ...

Three fixes for vision_analyze returning cryptic 400 "Invalid request data":

1. Pre-flight base64 size check — base64 inflates data ~33%, so a 3.8 MB
   file exceeds the 5 MB API limit. Reject early with a clear message
   instead of letting the provider return a generic 400.

2. Handle file:// URIs — strip the scheme and resolve as a local path.
   Previously file:///path/to/image.png fell through to the "invalid
   image source" error since it matched neither is_file() nor http(s).

3. Separate invalid_request errors from "does not support vision" errors
   so the user gets actionable guidance (resize/compress/retry) instead
   of a misleading "model does not support vision" message.

Closes #6677

2026-04-11 02:03:20 -07:00

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