Log debug message on tab activation failure instead of silently swallowing

Replace empty catch block with console.debug so Bootstrap Tab API
failures leave a diagnostic breadcrumb. Also add explicit format: html
to search-tabsets test fixture for consistency.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: cderv

src/resources/projects/website/search/quarto-search.js

@@ -1178,7 +1178,7 @@ function activateTabsWithMatches(mainEl) {
       try {
         new bootstrap.Tab(tabButton).show();
       } catch (e) {
-        // Skip this tab if Bootstrap Tab API fails
+        console.debug("Failed to activate tab for search match:", e);
       }
     }
   }

tests/docs/playwright/html/search-tabsets/_quarto.yml

@@ -7,3 +7,5 @@ website:
     left:
       - href: index.qmd
         text: Home
+
+format: html