Mwpw 204848 firefly unity showcase

[SamSawant876]

Change Summary:

• Wire the Unity prompt-bar widget onto the new C2 rich-content block for the Firefly site-redesign PDP (additive target-config.json entry, doesn't touch existing hero-marquee/showcase-marquee/upload-marquee hosts)
• Restyle the prompt widget for the Firefly redesign theme — card, verb-as-title header, prompt box, footer (model selector + Generate button), and both dropdowns ("Select a feature" and model list) — matched to Figma across lg/tablet/mobile breakpoints, gated entirely behind the firefly-redesign theme so the base widget is unchanged elsewhere
• Replace hardcoded spacing/radius/color values with s2a design tokens where an exact match exists
• Add per-verb placeholder text (:placeholder-input-image: / :placeholder-input-video:, falling back to the generic value)
• Fix a crash when model-config fetch fails (modelDropdown() now guards against a non-array this.models)
• Fix several latent base-widget bugs surfaced while rebuilding the dropdowns: the open/close animation silently fighting display/transform on menu open, checkmark position collapsing to position:absolute, and the model-list panel width/positioning

Resolves: MWPW-204848

Test URLs:

• Before: N/A
• After: https://main--da-cc--adobecom.aem.page/drafts/shyamr/product-marquee-dark?unitylibs=MWPW-204848-firefly-unity-showcase&ffredesign&mep=off&milolibs=site-redesign-foundation

Screenshots:

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Commits

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[sanjayms01]

Thanks for raising this PR!

Couple comments:

• Please remove all comments from the files. As much as they are helpful, we typically avoid adding comments to optimize on performance.
• Instead of calling isFireflyRedesign() in your conditionals, maybe you can just add a class variable in the constructor that calls the function and then you can just refer to the class variable thereafter.

I also reviewed the test page and noticed few issues with the CSS. I have shared these in the ticket for your reference.

Please all pull the latest changes from stage when you get a chance so the PR is up to date.

[asonnalagi]

Validated in branch. All looks fine. Done sanity on doodle pages as well. Complete E2E testing will be done on stage.
FYI: There is one open milo bug. https://jira.corp.adobe.com/browse/MWPW-207082
https://main--da-cc--adobecom.aem.page/drafts/shyamr/product-marquee-dark?unitylibs=MWPW-204848-firefly-unity-showcase&mep=off&milolibs=site-redesign-foundation