Remove JPEG conversion and preserve original image formats and filenames
to test support for all image file types. Refactor image processing logic
for clarity and maintainability.
Changes:
- Remove forced JPEG conversion (was using 0.9 compression quality)
- Preserve original filename extensions instead of forcing .jpg
- Refactor from 3 branches to 2 (removed unlikely UIImage branch)
- Replace if statement with guard for non-image attachment filtering
- Simplify error check from optional binding to nil check
- Extract filename extension helper method to reduce duplication
- Update default filename from "shared-image.jpg" to "shared-image"
The only conversion that may occur is to PNG (lossless) when raw data
cannot be read from a file URL, preserving image quality while ensuring
compatibility.
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