controller: fix country autocomplete — reveal dropdown with display:block (C)

Root cause (diagnosed live, not the hypothesised JS throw): filterCountries runs
fine and correctly populates the list, but reveals it with `list.style.display=''`.
The .geo-country-list CSS default is `display:none` (style.css), so clearing the
inline style falls back to none and the populated list never shows — no console
error, just an invisible dropdown. Latent since the geo feature's first commit.
Fix: reveal with 'block'. Verified live (typing "Német" now lists Németország).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

controller/internal/web/templates/settings.html

@@ -734,7 +734,10 @@ window.__registeredPaths=[{{range .StoragePaths}}{{if .Path}}"{{.Path}}",{{end}}
             count++;
         }
         list.innerHTML = html || '<div class="geo-country-option" style="opacity:.5">Nincs találat</div>';
-        list.style.display = count > 0 || q ? '' : 'none';
+        // Reveal with 'block', NOT '' — the .geo-country-list CSS default is display:none,
+        // and clearing the inline style ('') would fall back to that and keep the (populated)
+        // list hidden. This was the country-autocomplete "no list" bug.
+        list.style.display = count > 0 || q ? 'block' : 'none';
     };
 
     window.addCountry = function(code, name) {