chore: uniformize icons in Button / Input / Select / SelectMenu

Also adds `loading` to `Select` and `SelectMenu`

docs/content/3.forms/3.select.md

@@ -157,6 +157,29 @@ props:
 ---
 ::
 
+### Loading
+
+Use the `loading` prop to show a loading icon and disable the Input.
+
+Use the `loading-icon` prop to set a different icon or change it globally in `ui.select.default.loadingIcon`. Defaults to `i-heroicons-arrow-path-20-solid`.
+
+::component-card
+---
+baseProps:
+  name: 'select'
+  options:
+    - 'United States'
+    - 'Canada'
+    - 'Mexico'
+  placeholder: 'Search...'
+props:
+  loading: true
+  icon: 'i-heroicons-magnifying-glass-20-solid'
+excludedProps:
+  - icon
+---
+::
+
 ## Props
 
 :component-props