T06e forms files: file input, drop zone, shared file dialog; folder picker points to path input

tasks/ch21-30.md

@@ -224,7 +224,7 @@
 ## T26 Media — `src/media`
 
 - [ ] ImageViewer — zoom, pan, rotate, fit
-- [ ] ImageCropper
+- [ ] ImageCropper — also T06e ImageUpload
 - [ ] ImageAnnotator
 - [ ] ImageThumbnail
 - [ ] Lightbox / Gallery Viewer → `overlays::Lightbox`