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/Revenue/Index.cshtml

@@ -167,7 +167,7 @@
     @* ── MRR Trend Chart ── *@
     <div class="card shadow-sm mb-3">
         <div class="card-header fw-semibold py-2">
-            Estimated MRR Trend — Last 12 Months
+            Estimated MRR Trend &mdash; Last 12 Months
             <small class="text-muted fw-normal ms-2">(approximation based on current plan prices × active companies)</small>
         </div>
         <div class="card-body">
@@ -210,7 +210,7 @@
                                 <td class="small fw-semibold">@alert.CompanyName</td>
                                 <td class="small">@alert.PlanName</td>
                                 <td><span class="badge bg-@statusClass">@alert.Status</span></td>
-                                <td class="small">@(alert.EndDate?.ToString("MM/dd/yyyy") ?? "—")</td>
+                                <td class="small">@(alert.EndDate?.ToString("MM/dd/yyyy") ?? "&mdash;")</td>
                                 <td class="small @(alert.DaysUntilExpiry < 0 ? "text-danger" : "text-warning")">@daysText</td>
                                 <td>
                                     <a asp-controller="SubscriptionManagement" asp-action="Manage"
@@ -222,7 +222,7 @@
                 </table>
             </div>
 
-            <!-- Mobile card view — shown on screens < 992px (table-responsive hidden by mobile-cards.css) -->
+            <!-- Mobile card view &mdash; shown on screens < 992px (table-responsive hidden by mobile-cards.css) -->
             <div class="mobile-card-view">
                 <div class="mobile-card-list">
                     @foreach (var alert in Model.SubscriptionAlerts)
@@ -248,7 +248,7 @@
                             <div class="mobile-card-body">
                                 <div class="mobile-card-row">
                                     <span class="mobile-card-label">End Date</span>
-                                    <span class="mobile-card-value">@(alert.EndDate?.ToString("MM/dd/yyyy") ?? "—")</span>
+                                    <span class="mobile-card-value">@(alert.EndDate?.ToString("MM/dd/yyyy") ?? "&mdash;")</span>
                                 </div>
                                 <div class="mobile-card-row">
                                     <span class="mobile-card-label">Days</span>