feat(image): add image viewer with pan and zoom#3

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HelgeSverre wants to merge 15 commits intomainfrom

HelgeSverre/image-pan-zoom

Commits on Feb 28, 2026

docs: add image viewer pan/zoom design document
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docs: add image viewer implementation plan (13 tasks)
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feat(image): enable jpeg, gif, bmp, webp decoding in image crate
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feat(image): add ImageState, DragState, ImageMsg types and module
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feat(image): add ViewMode::Image variant with helper methods
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feat(image): add is_image_file() detection for image extensions
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feat(image): add update handler with zoom-toward-cursor and pan logic
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feat(image): add checkerboard theme config with Photoshop-like defaults
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feat(image): implement checkerboard + nearest-neighbor image rendering
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feat(image): load image files into ViewMode::Image on file open
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feat(image): wire mouse events for pan (click-drag) and zoom (scroll wheel)
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feat(image): show dimensions, zoom %, file size, format in status bar
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feat(image): add keyboard shortcuts for zoom in/out, fit, actual size
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fix(image): add Image* commands to FromStr and add integration tests
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fix(image): correct zoom-toward-cursor math and edge cases
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