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Convert GTK images with an alpha channel to RGB before JPEG encoding. Newer GdkPixbuf/Glycin encoders reject RGBA input for JPEG; the conversion preserves RGB values and leaves the source image unchanged. The image-save test now exercises both RGB and RGBA sources.
Found while validating the GTK4 migration in #3069.
Validation: 9 image testbed tests passed on GTK3, GTK4, GTK4/libadwaita, and macOS. Pre-commit, docs lint, and core/Travertino tests passed with 100% coverage.
PR Checklist:
Assisted-by: OpenAI Codex (GPT-6)