Sweep all .cshtml files for encoding corruption; add pre-commit guard

Replace all corruption variants with HTML entities across 226 view files:
- 3-char UTF-8-as-Win1252 sequences (ae-corruption)
- Standalone smart/curly quotes that break C# Razor expressions
- Partially re-corrupted variants where the 3rd byte was normalised to ASCII

tools/Fix-Encoding.ps1: re-runnable sweep; uses [char] code points so the
script itself never contains a literal non-ASCII character; supports -DryRun

.githooks/pre-commit: blocks commits containing the ae-corruption byte
signature (xc3xa2xe2x82xac); git core.hooksPath = .githooks so the
hook is repo-committed and active for all future work on this machine.

Build clean; 225 unit tests pass.

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

src/PowderCoating.Web/Views/UsageQuota/Index.cshtml

@@ -14,7 +14,7 @@
         return "bg-success";
     }
 
-    string LimitDisplay(int max) => max == -1 ? "∞" : max == 0 ? "—" : max.ToString();
+    string LimitDisplay(int max) => max == -1 ? "∞" : max == 0 ? "—" : max.ToString();
 
     int BarWidth(int used, int max)
     {
@@ -25,7 +25,7 @@
 
 @section Styles {
 <style>
-    /* Dark mode: bg-info text-dark badges — text-dark is unreadable in dark mode */
+    /* Dark mode: bg-info text-dark badges &mdash; text-dark is unreadable in dark mode */
     [data-bs-theme="dark"] .badge.bg-info.text-dark {
         color: #fff !important;
     }
@@ -184,7 +184,7 @@
         </div>
     </div>
 
-    @* Mobile card view — shown on screens < 992px *@
+    @* Mobile card view &mdash; shown on screens < 992px *@
     <div class="mobile-card-view d-lg-none">
         <div class="small text-muted mb-2">@Model.Count company(ies)</div>
         @if (!Model.Any())
@@ -257,7 +257,7 @@
         }
         if (max == 0)
         {
-            return new HtmlString($"<span class=\"small text-muted\">{used} / —</span>");
+            return new HtmlString($"<span class=\"small text-muted\">{used} / &mdash;</span>");
         }
         var pct = Math.Min(100, (int)Math.Round((double)used / max * 100));
         var color = pct >= 100 ? "danger" : pct >= 80 ? "warning" : "success";