fix: form ui search with input group

dashboards/templates/search_form.html

-<form action="" method="get" class="d-flex gap-2">
-  <input class="form-control" name="q" type="text" placeholder="Search..." />
-  <button type="submit" class="btn btn-primary">Enter</button>
+<form action="" method="get" class="input-group w-50">
+  <input
+    type="text"
+    name="q"
+    class="form-control"
+    placeholder="Search..."
+    aria-label="Search..."
+  />
+  <button class="input-group-text btn btn-primary">Search</button>
 </form>