Media: Restore accessible name for media items without a title

[itzmekhokan]

Saved attachments without a title were being announced as "uploading…" in the Media Library grid view. This restores a meaningful accessible name for them while keeping the upload-progress naming added in [62104].

What the problem was:

• [62104] (follow-up to #64883) set the grid item aria-label to title || 'uploading…' so in-progress uploads get an accessible name.
• That fallback also matched any saved attachment with no title, so every titleless image was announced as "uploading…".

What the fix does:

• Limits the "uploading…" fallback to items that are actually uploading.
• Falls back to the existing "(no title)" string for saved attachments that have no title.

Approach and why:

• A simple swap of "uploading…" → "(no title)" (per comment:1) would re-break #64883, since real uploads have no title yet. Gating on the model's uploading flag satisfies both tickets.
• Both "uploading…" and "(no title)" already exist as translatable core strings, so no new strings are introduced.

Testing instructions:

1. In the Media Library, ensure you have an image with no Title set.
2. Open the grid view (Media → Library, grid mode) and inspect the image tile: its <li class="attachment"> aria-label should read "(no title)" (verify with a screen reader or the browser a11y inspector), not "uploading…".
3. Upload a new file and, while it is uploading, confirm its tile's aria-label still reads "uploading…".
4. Confirm an image that has a title is unchanged (announced by its title).

Trac ticket: https://core.trac.wordpress.org/ticket/65438

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 4.8
Used for: Ticket and regression analysis (tracing the cause to [62104]) and drafting the one-line fix. All changes were reviewed, validated against the codebase, and are taken responsibility for by me.

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[Infinite-Null]

Hi @itzmekhokan,
Tested this PR and can see that it successfully resolves the issue.

I verified that media items without a title are now listed as "(no title)" instead of "uploading…" in the Media Library grid view. Media items with titles remain unaffected.

Screenshot attached for reference.

Before:

After