refactor(ui): clean dark theme — global-first, variable-backed approach

Phase 1: Replace all @apply dark: in @layer components with explicit :is(.dark)
rules for .app-input, .app-select, .app-label, .app-page-subtitle,
.app-page-title, .app-data-table th. This fixes unreliable PostCSS variant
handling in Tailwind v4 @layer components.

Phase 2: Add missing global dark overrides for interactive text colors:
text-blue-600/500, text-red-500/400, text-indigo-600/700, text-amber-600,
plus hover states. Add :is(.dark) option for native <select> dropdowns.

Phase 3: Add semantic component classes .app-action-edit, .app-action-delete,
.app-action-danger-btn — variable-backed, no hardcoded hex values.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/src/app/globals.css

@@ -376,11 +376,32 @@
 
 /* Missing text color overrides */
 .dark .text-amber-700   { color: rgb(251 191 36) !important; }
+.dark .text-amber-600   { color: rgb(251 191 36) !important; }
 .dark .text-orange-600  { color: rgb(251 146 60) !important; }
 .dark .text-green-600   { color: rgb(52 211 153) !important; }
 .dark .text-emerald-700 { color: rgb(52 211 153) !important; }
 .dark .text-brand-700   { color: rgb(var(--accent-400)) !important; }
 
+/* Interactive text — action links, errors, close buttons */
+.dark .text-blue-600   { color: rgb(96 165 250) !important; }
+.dark .text-blue-500   { color: rgb(96 165 250) !important; }
+.dark .text-red-500    { color: rgb(248 113 113) !important; }
+.dark .text-red-400    { color: rgb(251 113 133) !important; }
+.dark .text-indigo-600 { color: rgb(129 140 248) !important; }
+.dark .text-indigo-700 { color: rgb(129 140 248) !important; }
+
+/* Hover states for action links */
+.dark .hover\:text-blue-800:hover   { color: rgb(147 197 253) !important; }
+.dark .hover\:text-red-700:hover    { color: rgb(252 165 165) !important; }
+.dark .hover\:text-red-600:hover    { color: rgb(248 113 113) !important; }
+.dark .hover\:text-indigo-800:hover { color: rgb(165 180 252) !important; }
+
+/* Native <option> elements — best-effort across browsers */
+:is(.dark) option {
+  background-color: rgb(var(--surface-card));
+  color: rgb(var(--text-primary));
+}
+
 /* Divide override for gray-50 (ChargeabilityWidget sticky headers) */
 .dark .divide-gray-50 > * + * { border-color: rgb(var(--border-subtle)) !important; }
 
@@ -465,7 +486,6 @@
 
   .app-input {
     @apply w-full rounded-xl border border-gray-300 bg-white px-3 py-2 text-sm text-gray-900 outline-none transition;
-    @apply dark:border-gray-600 dark:bg-gray-800 dark:text-gray-100;
   }
 
   .app-input:focus {
@@ -474,6 +494,12 @@
     outline: none;
   }
 
+  :is(.dark) .app-input {
+    background-color: rgb(var(--surface-input));
+    border-color: rgb(var(--border-input));
+    color: rgb(var(--text-primary));
+  }
+
   :is(.dark) .app-input:focus {
     border-color: rgb(var(--accent-400));
     box-shadow: 0 0 0 3px rgba(var(--accent-400), 0.20), inset 0 0 8px rgba(var(--accent-400), 0.08);
@@ -482,11 +508,25 @@
   .app-select {
     @apply rounded-xl border border-gray-300 bg-white px-3 py-2 text-sm text-gray-900 outline-none transition;
     @apply focus:border-brand-500 focus:ring-4 focus:ring-brand-100/80;
-    @apply dark:border-gray-600 dark:bg-gray-800 dark:text-gray-100 dark:focus:ring-brand-900/50;
+  }
+
+  :is(.dark) .app-select {
+    background-color: rgb(var(--surface-input));
+    border-color: rgb(var(--border-input));
+    color: rgb(var(--text-primary));
+  }
+
+  :is(.dark) .app-select:focus {
+    border-color: rgb(var(--accent-400));
+    box-shadow: 0 0 0 3px rgb(var(--accent-400) / 0.20);
   }
 
   .app-label {
-    @apply mb-1.5 block text-[11px] font-semibold uppercase tracking-[0.18em] text-gray-500 dark:text-gray-400;
+    @apply mb-1.5 block text-[11px] font-semibold uppercase tracking-[0.18em] text-gray-500;
+  }
+
+  :is(.dark) .app-label {
+    color: rgb(var(--text-very-muted));
   }
 
   .app-page {
@@ -498,7 +538,7 @@
   }
 
   .app-page-title {
-    @apply font-display text-3xl font-semibold text-gray-900 dark:text-gray-100;
+    @apply font-display text-3xl font-semibold text-gray-900;
   }
 
   :is(.dark) .app-page-title {
@@ -509,7 +549,11 @@
   }
 
   .app-page-subtitle {
-    @apply text-sm text-gray-500 dark:text-gray-400;
+    @apply text-sm text-gray-500;
+  }
+
+  :is(.dark) .app-page-subtitle {
+    color: rgb(var(--text-muted));
   }
 
   .app-data-table {
@@ -536,7 +580,49 @@
   }
 
   .app-data-table th {
-    @apply text-[11px] font-semibold uppercase tracking-[0.16em] text-gray-500 dark:text-gray-400;
+    @apply text-[11px] font-semibold uppercase tracking-[0.16em] text-gray-500;
+  }
+
+  :is(.dark) .app-data-table th {
+    color: rgb(var(--text-very-muted));
+  }
+
+  /* ─── Semantic action classes ─────────────────────────────────────────── */
+
+  .app-action-edit {
+    @apply text-xs font-medium cursor-pointer transition-colors;
+    color: rgb(59 130 246);
+  }
+  .app-action-edit:hover {
+    color: rgb(37 99 235);
+    text-decoration: underline;
+  }
+  :is(.dark) .app-action-edit { color: rgb(96 165 250); }
+  :is(.dark) .app-action-edit:hover { color: rgb(147 197 253); }
+
+  .app-action-delete {
+    @apply text-xs font-medium cursor-pointer transition-colors;
+    color: rgb(239 68 68);
+  }
+  .app-action-delete:hover {
+    color: rgb(185 28 28);
+    text-decoration: underline;
+  }
+  :is(.dark) .app-action-delete { color: rgb(248 113 113); }
+  :is(.dark) .app-action-delete:hover { color: rgb(252 165 165); }
+
+  .app-action-danger-btn {
+    @apply rounded px-2 py-1 text-sm font-medium cursor-pointer transition-colors;
+    color: rgb(239 68 68);
+  }
+  .app-action-danger-btn:hover {
+    color: rgb(185 28 28);
+    background-color: rgb(254 242 242);
+  }
+  :is(.dark) .app-action-danger-btn { color: rgb(248 113 113); }
+  :is(.dark) .app-action-danger-btn:hover {
+    color: rgb(252 165 165);
+    background-color: rgb(127 29 29 / 0.2);
   }
 }