feat: enhance mobile vault filter UI and improve styling for better usability

webapp/src/styles/forms.css

@@ -31,19 +31,12 @@
 }
 
 select.input {
-  @apply py-0 pr-[42px];
+  @apply py-0 pr-3.5;
   line-height: 1.5;
-  appearance: none;
-  -webkit-appearance: none;
-  -moz-appearance: none;
-  background-image:
-    linear-gradient(45deg, transparent 50%, #365fa8 50%),
-    linear-gradient(135deg, #365fa8 50%, transparent 50%);
-  background-position:
-    calc(100% - 18px) calc(50% - 3px),
-    calc(100% - 12px) calc(50% - 3px);
-  background-size: 6px 6px, 6px 6px;
-  background-repeat: no-repeat;
+  appearance: auto;
+  -webkit-appearance: auto;
+  -moz-appearance: auto;
+  background-image: none;
 }
 
 input[type='file'].input {