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/CompanyHealth/Index.cshtml

@@ -198,7 +198,7 @@
             <form method="get" class="row g-2 align-items-end">
                 <div class="col-md-4">
                     <input name="search" value="@ViewBag.Search" class="form-control form-control-sm"
-                           placeholder="Company name or email…" />
+                           placeholder="Company name or email&hellip;" />
                 </div>
                 <div class="col-md-3">
                     <select name="risk" class="form-select form-select-sm">
@@ -274,7 +274,7 @@
                             <td>
                                 @if (h.RiskLevel == ChurnRisk.NeverActivated)
                                 {
-                                    <span class="text-muted">—</span>
+                                    <span class="text-muted">&mdash;</span>
                                 }
                                 else
                                 {
@@ -338,7 +338,7 @@
             </table>
         </div>
 
-        <!-- Mobile card view — shown on screens < 992px -->
+        <!-- Mobile card view &mdash; shown on screens < 992px -->
         <div class="mobile-card-view">
             <div class="mobile-card-list">
                 @foreach (var h in Model)
@@ -394,7 +394,7 @@
         @if (!Model.Any(h => h.RiskLevel != ChurnRisk.Healthy) && Model.Any())
         {
             <div class="card-footer text-center py-3 text-success">
-                <i class="bi bi-check-circle-fill me-2"></i>All tenants are healthy — no churn signals detected.
+                <i class="bi bi-check-circle-fill me-2"></i>All tenants are healthy &mdash; no churn signals detected.
             </div>
         }
     </div>