Opt the select into base-select from its own stylesheet

Plan step 36. menu.css left Tailwind's unlayered half for
material.components, where its `appearance: base-select` on the select
ties select.css's `appearance: none` in layer and specificity and loses
on order: select.css's block always follows the menu.css it imports. The
customizable select would have fallen back to the native list. The
select's own opt-in now sits in select.css's @supports block; menu.css
keeps the picker's. A test pins where each is written.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/css/components/menu.css

@@ -320,7 +320,9 @@
     }
 
     @supports (appearance: base-select) {
-        select[data-md-field-control],
+        /* The select itself opts in from select.css, after its own `appearance: none`: both sit in
+           `material.components` with the same specificity, and select.css's block always comes
+           after this file, which it imports. */
         select[data-md-field-control]::picker(select) {
             appearance: base-select;
         }

resources/css/components/select.css

@@ -43,6 +43,7 @@
        the arrow turns over, as the searchable choices' does. */
     @supports (appearance: base-select) {
         select[data-md-field-control] {
+            appearance: base-select;
             display: flex;
             align-items: center;
             border: 0;

tests/Feature/Components/MenuTest.php

@@ -392,7 +392,18 @@ it('draws the dropdown a select or a searchable choices field opens, the same fa
             'background-color' => 'var(--md-sys-color-secondary-container)',
             'color' => 'var(--md-sys-color-on-secondary-container)',
         ])
-        ->and($css->css)->toContain('@supports (appearance: base-select) {')
+        ->and($css->declarations('select[data-md-field-control]::picker(select)', ['@supports (appearance: base-select)']))->toMatchArray(['appearance' => 'base-select'])
         ->and(ComponentStylesheet::read('select')->imports())->toContain('./menu.css')
         ->and(ComponentStylesheet::read('choices')->imports())->toContain('./menu.css');
 });
+
+it('opts the select itself into the customizable select after its own appearance: none', function () {
+    // menu.css and select.css share `material.components` and the selector's specificity, and
+    // select.css's block always follows the menu.css it imports: the opt-in has to be written
+    // there, or `appearance: none` wins and the picker is never the menu.
+    $select = ComponentStylesheet::read('select');
+
+    expect($select->declarations('select[data-md-field-control]'))->toMatchArray(['appearance' => 'none'])
+        ->and($select->declarations('select[data-md-field-control]', ['@supports (appearance: base-select)']))->toMatchArray(['appearance' => 'base-select'])
+        ->and(ComponentStylesheet::read('menu')->has('select[data-md-field-control]', ['@supports (appearance: base-select)']))->toBeFalse();
+});