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/Budgets/Edit.cshtml

@@ -1,8 +1,8 @@
-@using PowderCoating.Web.Controllers
+@using PowderCoating.Web.Controllers
 @model BudgetCreateVm
 
 @{
-    ViewData["Title"] = $"Edit Budget — {Model.Name}";
+    ViewData["Title"] = $"Edit Budget — {Model.Name}";
     ViewData["PageIcon"] = "bi-pencil";
     var months = new[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
 }
@@ -24,7 +24,7 @@
     <div class="card border-0 shadow-sm mb-4">
         <div class="card-header bg-white border-0 py-3">
             <h5 class="mb-0 fw-semibold">
-                <i class="bi bi-pie-chart me-2 text-primary"></i>@Model.Name — @Model.FiscalYear
+                <i class="bi bi-pie-chart me-2 text-primary"></i>@Model.Name — @Model.FiscalYear
             </h5>
         </div>
         <div class="card-body">
@@ -56,7 +56,7 @@
                 </button>
             </div>
         </div>
-        <div class="alert alert-info py-2 mx-3 mt-3 mb-0 small">
+        <div class="alert alert-info alert-permanent py-2 mx-3 mt-3 mb-0 small">
             <i class="bi bi-info-circle me-1"></i>
             Enter monthly amounts for each Revenue and Expense account. Leave a row at zero to exclude that account from the budget. Amounts represent expected <strong>activity</strong> for the period (not running totals).
         </div>