Reach M3's 48px target from every 40px navigation control

The theme toggle and the account-menu avatar are drawn 40px and had no target
extension; both now carry `touch-target`, and the avatar's clipping moves from
the button (which would have cut the pseudo-target off) to the <img>. The rail's
hand-rolled `after:` target becomes the same utility.
Plan: docs/plans/material-3-alignment.md, step 14 (navigation N-01).

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

tests/Feature/Components/AppBarTest.php

@@ -86,6 +86,8 @@ it('switches the theme through the store in three shapes', function () {
     expect((string) $this->blade('<x-theme-toggle />'))
         ->toContain('data-theme-toggle="toggle"')
         ->toContain('aria-label="Dark theme"')
+        // 40px drawn, 48px reached: M3's minimum target (N-01).
+        ->toContain('touch-target')
         ->toContain('$store.theme.toggle()')
         ->and((string) $this->blade('<x-theme-toggle mode="cycle" />'))
         ->toContain('data-theme-toggle="cycle"')
@@ -107,12 +109,15 @@ it('opens an account menu from the initials of a name', function () {
     expect($html)
         ->toContain('aria-label="Account"')
         ->toContain('data-account-menu')
+        // The 40px avatar reaches 48px, and nothing clips the pseudo-target (N-01).
+        ->toContain('touch-target')
+        ->not->toContain('overflow-hidden')
         ->toMatch('/>\s*AM\s*<\/button>/')
         ->toContain('anna@example.com')
         ->toContain('Settings')
         ->toContain('data-account-theme')
         ->toContain('Sign out')
         ->and((string) $this->blade('<x-account-menu avatar="/anna.jpg" :theme="false" />'))
-        ->toContain('<img src="/anna.jpg"')
+        ->toContain('<img src="/anna.jpg" alt="" class="size-full rounded-corner-full object-cover" />')
         ->not->toContain('data-account-theme');
 });

tests/Feature/Components/NavigationRailTest.php

@@ -22,6 +22,8 @@ it('gives the collapsible, modal and adaptive rails a menu button and the store'
         ->toContain('data-navigation-rail-menu')
         ->toContain('aria-label="Collapse navigation"')
         ->toContain('aria-expanded="true"')
+        // The 40px menu button reaches M3's 48px target through the shared utility (N-01).
+        ->toContain('touch-target')
         ->not->toContain('data-navigation-rail-scrim')
         ->not->toContain('x-trap')
         ->and((string) $this->blade('<x-navigation-rail mode="modal" />'))