MWPW-192828: add image-to-video widget with dropzone, model/aspect-ratio selectors, and generate flow

[sanjayms01]

Summary

Adds a new image-to-video Unity widget for the Firefly image-to-video AI feature page. The widget is injected into the upload-marquee block and provides a dropzone for image upload, a text prompt field, model/aspect-ratio selectors (spreadsheet-authorable), a "More" filters button, and a Generate CTA that submits to the Firefly backend and redirects on success.

Changes

• unitylibs/core/widgets/image-to-video/image-to-video.js — new widget class with dropzone, prompt field, model selector, aspect ratio selector (dynamically tied to model), more button, and generate CTA
• unitylibs/core/widgets/image-to-video/image-to-video.css — scoped dark-theme styles matching Figma specs (rgb(27,27,27) panel, rgb(50,50,50) model tag, rgb(44,44,44) aspect tag, responsive at 599px)
• unitylibs/core/workflow/workflow.js — registered image-to-video in getWidgetRegistry()
• unitylibs/core/workflow/workflow-firefly/target-config.json — updated upload-marquee entry with renderWidget: true and new actionMap for generate-itv and moreFilters
• unitylibs/core/workflow/workflow-firefly/action-binder.js — added generateItvContent(), navigateToMoreFilters(), extended handleAction(), updated error toast fallback for .itv-panel
• test/core/workflow/image-to-video.test.js — 15 unit tests covering rendering, state, interactions, and ActionBinder integration
• test/core/workflow/mocks/itv-body.html — HTML fixture for tests

Testing

15 new tests added covering: DOM rendering (panel, dropzone, prompt, model/aspect selectors, more button, generate CTA), widget state initialization (model ID, aspect ratio, moreFiltersUrl), file selection behavior, dynamic aspect ratio updates on model change, and ActionBinder action dispatch. Full suite: 743 passed, 0 failed.

Jira: MWPW-192828

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Commits

• 67f4186 ✅ (latest)