Add detailed console logging throughout the image upload pipeline to help
diagnose upload issues:
- Log file metadata and validation steps in imageValidation.ts
- Log image processing and file saving operations in imageProcessing.ts
- Log form data and processing steps in recipe add page action
- Log API request details and upload progress in img/add endpoint
All logs are prefixed with component name ([ImageValidation], [ImageProcessing],
[RecipeAdd], [API:ImgAdd]) for easy filtering and debugging.
Refactor recipe add/edit routes from client-side fetch to proper SvelteKit
form actions with progressive enhancement and comprehensive security improvements.
**Security Enhancements:**
- Implement 5-layer image validation (file size, MIME type, extension, magic bytes, Sharp structure)
- Replace insecure base64 JSON encoding with FormData for file uploads
- Add file-type@19 dependency for magic bytes validation
- Validate actual file type via magic bytes to prevent file type spoofing
**Progressive Enhancement:**
- Forms now work without JavaScript using native browser submission
- Add use:enhance for improved client-side UX when JS is available
- Serialize complex nested data (ingredients/instructions) via JSON in hidden fields
- Translation workflow integrated via programmatic form submission
**Bug Fixes:**
- Add type="button" to all interactive buttons in CreateIngredientList and CreateStepList
to prevent premature form submission when clicking on ingredients/steps
- Fix SSR errors by using season_local state instead of get_season() DOM query
- Fix redirect handling in form actions (redirects were being caught as errors)
- Fix TranslationApproval to handle recipes without images using null-safe checks
- Add reactive effect to sync editableEnglish.images with germanData.images length
- Detect and hide 150x150 placeholder images in CardAdd component
**Features:**
- Make image uploads optional for recipe creation (use placeholder based on short_name)
- Handle three image scenarios in edit: keep existing, upload new, rename on short_name change
- Automatic image file renaming across full/thumb/placeholder directories when short_name changes
- Change detection for partial translation updates in edit mode
**Technical Changes:**
- Create imageValidation.ts utility with comprehensive file validation
- Create recipeFormHelpers.ts for data extraction, validation, and serialization
- Refactor /api/rezepte/img/add endpoint to use FormData instead of base64
- Update CardAdd component to upload via FormData immediately with proper error handling
- Use Image API for placeholder detection (avoids CORS issues with fetch)
