fix(ui): use dropdown-level shadow for popovers and floating menus

Replace inline modal-shadow styles on toasts, popups, and warning
banners with a shared `surface-popover` utility that uses the lighter
dropdown shadow instead of the heavier modal shadow. Apply the same
`shadow-dropdown` swap to the deployments indicator pill and the
server/deployment log floating menus. Remove now-unused console
header and error-contact-link rules from app.css, and add a test
asserting these surfaces consistently use the dropdown shadow.

tests/Unit/ShadowConsistencyTest.php

@@ -0,0 +1,57 @@
+<?php
+
+function cssSource(string $file): string
+{
+    return file_get_contents(__DIR__.'/../../resources/css/'.$file);
+}
+
+function bladeSource(string $path): string
+{
+    return file_get_contents(__DIR__.'/../../resources/views/'.$path);
+}
+
+it('gives the shared popover surface the dropdown lift, not the modal lift', function () {
+    $utilities = cssSource('utilities.css');
+
+    expect($utilities)
+        ->toContain('@utility surface-popover')
+        ->toContain('var(--shadow-dropdown)');
+
+    // The surface-popover block itself must not fall back to the heavy modal shadow.
+    preg_match('/@utility surface-popover\s*\{(.*?)\}/s', $utilities, $match);
+    expect($match[1] ?? '')
+        ->toContain('var(--shadow-dropdown)')
+        ->not->toContain('var(--shadow-modal)');
+});
+
+it('renders toasts and change-pending popovers with the shared dropdown-level surface', function (string $path) {
+    $source = bladeSource($path);
+
+    expect($source)
+        ->toContain('surface-popover')
+        ->not->toContain('--shadow-modal');
+})->with([
+    'components/toast.blade.php',
+    'components/configuration-warning.blade.php',
+    'components/proxy-configuration-warning.blade.php',
+    'components/popup-small.blade.php',
+    'livewire/deployments-indicator.blade.php',
+]);
+
+it('uses the dropdown shadow on floating menus instead of the modal shadow', function (string $path) {
+    expect(bladeSource($path))
+        ->toContain('shadow-dropdown')
+        ->not->toContain('shadow-modal');
+})->with([
+    'livewire/server/show.blade.php',
+    'livewire/project/application/deployment/show.blade.php',
+]);
+
+it('gives the command palette the shared dropdown lift', function () {
+    $app = cssSource('app.css');
+
+    preg_match('/\.command-palette\s*\{(.*?)\}/s', $app, $match);
+    expect($match[1] ?? '')
+        ->toContain('var(--shadow-dropdown)')
+        ->not->toContain('var(--shadow-modal)');
+});