Reuse copyright/license metadata + "Add this info to all images" in C&L dialog

[hatton]

What this does

Adds tools to the Copyright & License dialog for reusing metadata from other images (pull), and causing all other images to get the same metadata as the current image (push).

• Adds Metadata "Shortcuts" chooser — gathers copyright/license metadata from the other images in the book (plus the book's own copyright/license) so the user can apply an existing set with one click instead of retyping. Gathering is progressive (one image at a time) and stops when the dialog closes. The set matching the image's current metadata is shown checked and pinned to the top of the list.
• "Add this info to all images in this book" button — replaces the old WinForms yes/no "copy to all images?" MessageBox. The dialog stays open and shows a Working… spinner, then a Done confirmation driven by a websocket event when the copy actually finishes.
• Launch the dialog via the workspace (top window) bundle rather than the page iframe, so saving the metadata (which reloads the page iframe) no longer tears the dialog down.

The reuse chooser is offered only when editing image metadata, not for the book's own copyright/license.

Backend

New read-only endpoints to list the book's creditable image file names and to read a single image's metadata, plus a static ImageApi.GetCreditableImageFileNamesInBook helper.

🤖 Generated with Claude Code

Devin review

---

This change is 

[greptile-apps]

Greptile Summary

This PR adds two reuse tools to the Copyright & License dialog: a progressive "Shortcuts" chooser that scans the book's images for existing metadata packages, and an "Add this info to all images" button with a WebSocket-driven working/done state machine. It also moves dialog launch from the page iframe to the workspace bundle so that saving (which reloads the iframe) no longer tears down the dialog.

• MetadataChooser (MetadataChooser.tsx, metadataReuseUtils.ts) gathers metadata one image at a time, de-duplicates by a stable JSON key, pins the currently-active package to the top, and caps the list height to three visible rows.
• Push-to-all flow (CopyrightAndLicenseDialog.tsx, CopyrightAndLicenseApi.cs, EditingModel.cs) replaces the old WinForms MessageBox with a button + spinner + done-check pattern; every code path (save failure, non-normal image, image-toolbox mode) calls NotifyCopyrightPushedToAllImages so the spinner never hangs.
• Dialog-launch fix (bloomImages.ts, canvasControlRegistry.ts) routes both image-button and canvas-tool launches through getWorkspaceBundleExports(), and EditingView.cs adds URL-decode/path normalisation (BL-16446) before the filename reaches PalasoImage.

Important Files Changed

Filename	Overview
DistFiles/localization/en/BloomMediumPriority.xlf	Adds 5 new localizable strings for the metadata chooser, push-to-all button, and status labels; note that the two now-unused strings in en/Bloom.xlf (from the deleted MessageBox code) are not marked obsolete.
src/BloomBrowserUI/bookEdit/copyrightAndLicense/CopyrightAndLicenseDialog.tsx	Integrates MetadataChooser, adds push-to-all-images state machine driven by a WebSocket event, and guards the OK button during in-flight pushes; overall logic is sound.
src/BloomBrowserUI/bookEdit/copyrightAndLicense/MetadataChooser.tsx	New component that progressively gathers and displays reusable metadata options; per-image errors are handled individually, but the list-endpoint fetch has an existing unhandled rejection (already flagged in a previous review comment).
src/BloomBrowserUI/bookEdit/copyrightAndLicense/metadataReuseUtils.ts	New utility file with computePackageKey and getLicenseShorthand; logic is clean and consistent with the existing LicenseBadge.tsx patterns.
src/BloomExe/web/controllers/CopyrightAndLicenseApi.cs	Adds two read-only endpoints for the metadata chooser and rewires push-to-all to use a WebSocket notification instead of a blocking MessageBox; error paths all call NotifyCopyrightPushedToAllImages so the spinner never hangs.
src/BloomExe/Edit/EditingView.cs	Removes the old MessageBox prompt, adds URL-decode/path-only normalisation for the image filename (BL-16446 fix), and delegates 'copy to all' to the new WebSocket-notification flow.
src/BloomExe/Edit/EditingModel.cs	Adds WebSocket notification method and constants for signalling 'push complete' to the still-open dialog; straightforward and well-commented.
src/BloomExe/web/controllers/ImageApi.cs	Extracts a new static helper GetCreditableImageFileNamesInBook from the existing filtering logic so CopyrightAndLicenseApi can reuse it without an ImageApi instance.
src/BloomBrowserUI/bookEdit/js/bloomImages.ts	Switches dialog launch to getWorkspaceBundleExports().showCopyrightAndLicenseDialog so page-iframe reloads no longer tear down the dialog.
src/BloomBrowserUI/bookEdit/toolbox/canvas/canvasControlRegistry.ts	Same workspace-bundle launch fix as bloomImages.ts, applied to the canvas-tool copyright menu action.

_{Reviews (3): Last reviewed commit: "Fix hanging spinner on "Add to all image..." | Re-trigger Greptile}