feat(ebook): implement phrase matching functionality and UI enhancements

python/ebook_search/api/static/style.css

@@ -181,6 +181,12 @@ textarea:focus {
     flex-wrap: wrap;
 }
 
+.search-toggles {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 14px;
+}
+
 button {
     padding: 10px 20px;
     font: inherit;