[TEST] Print Prep tool

[jbaddley]

Route

/print-prep

Scenarios to test

Upload

• Dropzone is visible on load with correct label text
• Uploading a single JPEG displays it in the 3-column thumbnail grid
• Uploading 6 images fills two rows of the grid (3 per row)
• The "Add" button in the sidebar header adds more images to the grid
• Uploaded image filenames are accessible (via title or alt)

Thumbnail grid

• Each thumbnail shows the image scaled to fill the grid cell
• The max print size label is displayed below each thumbnail (e.g. Up to 12.0×8.0")
• Clicking a thumbnail selects it (border highlight appears)
• The selected image appears in the right-panel editor
• Done checkmark is NOT visible before marking an image done

Print size selection

• Print size pills are visible: Original, 4×6, 5×7, 4×4, 8×10, 5×5, 3.5×5, 11×14, 12×12
• Clicking "4×6" highlights that pill and updates the preview aspect ratio
• Preview image switches to object-fit: cover with the selected ratio
• The export info note shows the correct pixel dimensions (e.g. 1800×1200 for 4×6 landscape)
• A quality warning appears if the image is too small for the selected size
• Clicking "Original" removes the size constraint

Color filters

• 8 filter swatch buttons are visible: Original, B&W, Sepia, Warm, Cool, Retro, Cinematic, Bright
• Each swatch shows the current image with that filter applied
• Clicking "B&W" applies a grayscale CSS filter to the main preview
• Clicking "Original" removes the filter

Adjustments

• Brightness slider is present; moving it changes the preview brightness
• Contrast slider is present; moving it changes the preview contrast
• Slider values display the percentage delta (e.g. +30%, -20%)

Mark Done flow

• "Mark Done" button is present and enabled for the selected image
• Clicking it adds a checkmark to the thumbnail in the grid
• The editor auto-advances to the next image in the grid
• The done count in the sidebar header updates (e.g. 1 done)
• After all images are marked done, the button is disabled for each

Reset

• "Reset" button clears all edits (filter, size, brightness, contrast) for the current image

Download ZIP

• "Download ZIP" button is visible in the sidebar footer
• Clicking it triggers a .zip file download
• The ZIP contains one JPEG per uploaded image
• Filenames in the ZIP include the print size suffix (e.g. photo_4x6.jpg)

Google Drive section (logged-out)

• The Google Drive import section is NOT visible for unauthenticated users

AI Upscale section

• For a non-Pro user, an upgrade prompt is shown instead of the upscale button

Acceptance criteria

• Grid renders all uploaded images with print size labels
• Filter swatches apply visible CSS filters to the preview
• Mark Done auto-advances; ZIP download contains correctly named JPEGs