fix: Add Safari canvas filter fallback implementation #342
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- Implement manual pixel manipulation for Safari browsers where context.filter is unreliable - Add improved Safari detection that excludes Electron/Chrome/Chromium - Add applyFallbackFilters function for brightness, contrast, saturation, and grayscale - Add testing mode via ?forceFilterFallback=true URL parameter - Add comprehensive testing documentation (TESTING_SAFARI_FIX.md) - Fix issue where filters worked in CSS preview but not in saved canvas images on Safari Fixes Safari canvas filter issue where filters were not applied to saved images
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Fixes Safari canvas filter issue where filters were not applied to saved images