Media: Refresh attachment tile aria-label when model data loads

[sornapudisuresh]

Media Library grid tiles can keep a stale aria-label (uploading… / (no title)) when the view is created for an id-only attachment model that is still fetching. The visible CSS label overlay (added in 7.0) makes that staleness obvious to everyone, not only screen reader users.

Problem

wp.media.view.Attachment computes aria-label only in attributes(), and Backbone evaluates that once during _ensureElement(). Core (and Gutenberg) often create tiles via Attachment.get( id ) + fetch(), so the label is computed from empty model data and never updates when the model later receives a title — even though render() re-runs on model change.

This is distinct from #65438 / [62892], which only changes which fallback string is used for a titleless model.

Fix

• Factor the label computation into getAriaLabel().
• Re-apply aria-label at the end of render() once the model has data.
• Skip subclasses that reset attributes (e.g. Attachment.Details, see #47458) so we do not add inappropriate attributes there.
• Leave aria-checked alone so selection state from updateSelect() is not clobbered.

Testing instructions

1. Use the Playground blueprint from the Trac ticket, or locally:
   • Create a post with a titled featured image.
   • Reload the post edit screen and open the Featured image modal.
2. Confirm the selected tile label updates to the attachment title (not stuck on uploading… / (no title)).
3. Confirm untitled tiles still show (no title), and in-progress uploads still show uploading….
4. Confirm Attachment Details (sidebar) is unchanged (no checkbox/aria-label attributes added).

Trac ticket: https://core.trac.wordpress.org/ticket/65852

Use of AI Tools

AI assistance: Yes
Tool(s): Cursor
Model(s): Cursor Grok 4.5
Used for: Implementation assistance following the approach suggested on the Trac ticket. Changes were reviewed against the codebase and existing Attachment.Details attribute reset pattern.

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

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Props sureshsornapudi09, afercia.

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[github-actions]

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[afercia]

I quickly tested the approach in this PR and wanted to note that it also fixes a small quirk when uploading multiple attachments at the same time in the Media Library, which makes sense given the label is now updated on render.

Before:

• Go to the Media Library, grid mode.
• Upload 10 attachments at the same time by dragging them into the Media Library.
• Observe that while the attachments get uploaded, the label in the tile is uploading… for all of them.
• Observe that only when all the 10 attachments are fully uploaded, their labels update to the actual title.

After:

• Repeat the steps above.
• Observe that each attachment label updates as soon as each individual attachment is fully uploaded.

[afercia]

LGTM

Pushed a couple commits:

• rebased on top of latest trunk
• added @since tag
• added QUnit tests

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 64293
GitHub commit: 9d65c0e

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.