Design consistency audit fixes: alerts, cards, dark mode, utilities

Alert sweep (113 alerts, 79 files):
  All persistent static banners now carry alert-permanent so the
  layout's 5-second auto-dismiss cannot swallow guidance, warnings,
  or validation errors. Transient dismissible toasts left untouched.

CSS fixes (site.css):
  .card.shadow-sm      — strips rogue border from ~40 drifted cards
  .card-header.bg-white — rebinds to var(--bs-body-bg) so card
                          headers follow dark/light theme correctly
  Typography utilities  — .text-2xs (.68rem), .text-xs (.73rem)
  Token color classes   — .text-ember, .text-ok, .text-bad,
                          .text-warn, .text-cool, .bg-paper-2
  Layout utilities      — .mw-xs/sm/md/lg replace inline max-width
  Comment              — documents text-ember vs text-primary intent

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

src/PowderCoating.Web/Views/Maintenance/Delete.cshtml

@@ -1,4 +1,4 @@
-@model PowderCoating.Application.DTOs.Maintenance.MaintenanceRecordDto
+@model PowderCoating.Application.DTOs.Maintenance.MaintenanceRecordDto
 
 @{
     ViewData["Title"] = "Delete Maintenance Record";
@@ -14,7 +14,7 @@
             </a>
         </div>
 
-        <div class="alert alert-danger" role="alert">
+        <div class="alert alert-danger alert-permanent" role="alert">
             <i class="bi bi-exclamation-triangle me-2"></i>
             <strong>Warning:</strong> This action cannot be undone.
         </div>
@@ -22,7 +22,7 @@
         <div class="card border-0 shadow-sm mb-4">
             <div class="card-header bg-danger bg-opacity-10 border-0 py-3">
                 <h5 class="mb-0 text-danger">
-                    <i class="bi bi-wrench me-2"></i>@Model.MaintenanceType — @Model.EquipmentName
+                    <i class="bi bi-wrench me-2"></i>@Model.MaintenanceType — @Model.EquipmentName
                 </h5>
             </div>
             <div class="card-body">