feat(panel): additional media groups on catalog edit screens (spec 0060)

[glennjacobs]

Summary

Brings v1's registerable media groups into the new Inertia panel. Previously the panel was hardcoded to a single images collection with image-only uploads; the Filament panel and core already supported arbitrary collections per model via MediaDefinitions, but the Inertia panel dropped it.

Now a model's MediaDefinitions can declare any number of collections beyond images — document downloads, a second image gallery, etc. — and each renders as its own section on the products, brands, collections and product-types edit screens. Image collections keep the rich uploader (grid, hero, focal, crop); non-image collections get a new file-list uploader (download, rename, reorder, delete). Groups are declared in code, matching v1 and Filament — no admin UI.

Spec: specs/0060-panel-media-groups.md.

Changes

Core

• StandardDefinitions images collection declares its accepted mime types.
• HasMedia::thumbnail() and ReorderMedia primary promotion are scoped to the configured image collection, so media in other groups can never become the model thumbnail (MediaObserver was already scoped).

Panel backend

• New Support/Media/MediaGroups prop builder — one mediaGroups entry per registered collection (type: image|file, accept, items, per-collection URLs), replacing the inline media block duplicated across the four edit controllers.
• New HandlesMediaReorder trait + shared Http/Requests/Media/{MediaStoreRequest,MediaUpdateRequest} abstracts. A request can only write to a collection the model registers; per-group file rules come from the collection's mime allowlist; alt text is required for images only.
• The four *MediaControllers / *MediaStoreRequests / *MediaUpdateRequests are collection-aware; the collection travels in the request body so route names are unchanged.

Panel frontend

• MediaManager is now prop-driven (renders any image collection).
• New FileManager + FileEditDialog for non-image groups.
• MediaGroups wrapper dispatches per group type; looped on all four edit pages.
• File-group lang keys added across all 16 locales.

Notes / behaviour changes

• Inertia prop rename on the four edit pages: media → mediaGroups (internal to first-party pages, not part of the add-on contract surface).
• HasMedia::thumbnail() / image primary now scoped to the image collection — inert for any single-collection install, only changes behaviour once a second collection exists.
• No MediaDefinitions contract change, no migrations, no new dependencies.

Testing

• Pest: core (thumbnail/primary scoping + mime rejection) and panel (per-group mime enforcement, non-registered-collection rejection, multi-group prop shape, reorder without thumbnail hijack).
• Vitest: updated MediaManager, new FileManager.
• Full local run green: core 1169, panel 730, admin 235, filament 45; vitest 237; PHPStan clean; type-check clean; npm run build ok.

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