MWPW-192852: add prompt-bar-upload widget for image-to-video Firefly feature

[sanjayms01]

Summary

Adds a new prompt-bar-upload Unity widget for the Image-to-Video Firefly feature page. The widget provides an image dropzone with upload/spinner/preview states, a prompt textarea, model and aspect-ratio dropdowns (aspect ratios keyed per model from a spreadsheet config), a "More" filters button, and a "Generate" CTA that passes all inputs to the connector backend.

Changes

• unitylibs/core/widgets/prompt-bar-upload/prompt-bar-upload.js — New widget class (dropzone, prompt, model/aspect dropdowns, error toast overlay, generate flow)
• unitylibs/core/widgets/prompt-bar-upload/prompt-bar-upload.css — Dark-themed styles with ex-pbu-* class prefix, responsive mobile layout
• unitylibs/core/workflow/workflow.js — Registered prompt-bar-upload in getWidgetRegistry()
• unitylibs/core/workflow/workflow-firefly/action-binder.js — Added getSelectedAspectRatio() and getUploadedImageAssetId() getters; extended generateContent() payload with aspectRatio and referenceImageId
• test/core/workflow/mocks/ff-upload-body.html — HTML fixture for unit tests
• test/core/workflow/prompt-bar-upload.test.js — 42 unit tests; full suite 770 passed, 0 failed

Testing

Full test suite run: 770 tests passed, 0 failed, 3 skipped. Coverage includes widget initialization, DOM structure, slot parsing, model/aspect dropdowns, file upload wiring, drag-and-drop, spinner/preview states, error toast show/hide, and actionMap return value.

Jira: MWPW-192852

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Commits

• b580aa9 ✅ (latest)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.73520% with 98 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.42%. Comparing base (6f10ed2) to head (b580aa9).

Files with missing lines	Patch %	Lines
...ore/widgets/prompt-bar-upload/prompt-bar-upload.js	84.41%	98 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            stage     #745      +/-   ##
==========================================
+ Coverage   80.00%   80.42%   +0.42%     
==========================================
  Files          28       29       +1     
  Lines        7975     8617     +642     
==========================================
+ Hits         6380     6930     +550     
- Misses       1595     1687      +92     

Flag	Coverage Δ
unittests	80.42% <84.73%> (+0.42%)	⬆️

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