sneak b55b75cbe7 Fix silent fallbacks for unsupported formats and fit modes ...

- Return ErrUnsupportedOutputFormat for WebP/AVIF encoding
- Return ErrInvalidFitMode for unknown fit mode values
- Add ValidateFitMode() for input validation
- Validate fit mode at handler level before processing

Silent fallbacks violate the principle of least surprise and mask bugs.
When a user explicitly specifies a value, we should either honor it or
return an error - never silently substitute a different value.

2026-01-08 11:08:22 -08:00

6.2 KiB

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