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fix: convert to sRGB before stripping ICC profile to preserve colors (#702)

* fix: convert to sRGB before stripping ICC profile to preserve colors

When strip_icc() removes an ICC profile from an image in a non-sRGB color
space (ProPhoto RGB, Adobe RGB, etc.), the pixel values remain in the original
color space but browsers assume untagged images are sRGB. This causes colors
to appear dull/muted.

Now strip_icc() converts to sRGB using vips_icc_transform() before removing
the profile, preserving correct color appearance.

Also adds to_colorspace(profile) filter for explicit ICC profile conversions.

Fixes #324

* fix typo

* add test cases

* add test cases

* add test cases

* add test cases

* test: update golden files

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Co-authored-by: Mevin <mevinbabuc@gmail.com>
Co-authored-by: cshum <293790+cshum@users.noreply.github.com>

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