Closes #11910

Technical

The ebook/everything toggle in templates/type/author/view.html was wrapped in a $if books_count > 1: block, causing it to disappear when search results returned 0 or 1 works.

The fix applies asymmetric visibility logic:

• "Show only ebooks" is shown when mode=everything and books_count > 0 (no point filtering down to ebooks if there's nothing to filter)
• "Show everything" is always shown when mode=ebooks, regardless of count, so users can always escape back to the full unfiltered view

Testing

1. Go to an author page locally, e.g. http://localhost:8080/authors/OL18319A/Mark_Twain
2. Search for a term that returns a single result, e.g. ?mode=everything&q=Huckleberry
3. Confirm "— Show only ebooks?" is visible with 1 result
4. Click it — confirm you land on mode=ebooks view with "— Show everything by this author?" still visible
5. Search ?mode=ebooks&q=Huckleberry123 — confirm "— Show everything by this author?" remains visible even with 0 results

Screenshot

1 work — "Show only ebooks?" visible:

1 work — "Show everything?" visible:

0 works — "Show everything by this author?" visible:

Stakeholders

@mekarpeles @davidscotson