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/VendorCredits/Details.cshtml

@@ -79,7 +79,7 @@
                     <dd class="col-8">@Model.CreditDate.ToString("MMMM d, yyyy")</dd>
 
                     <dt class="col-4 text-muted">AP Account</dt>
-                    <dd class="col-8">@Model.APAccount?.AccountNumber – @Model.APAccount?.Name</dd>
+                    <dd class="col-8">@Model.APAccount?.AccountNumber &ndash; @Model.APAccount?.Name</dd>
 
                     @if (!string.IsNullOrWhiteSpace(Model.Memo))
                     {
@@ -128,7 +128,7 @@
                         @if (line.AccountId.HasValue && accountMap.TryGetValue(line.AccountId.Value, out var acct))
                         { @acct }
                         else
-                        { <span class="text-muted">—</span> }
+                        { <span class="text-muted">&mdash;</span> }
                     </td>
                     <td class="text-muted small">@line.Description</td>
                     <td class="text-end">@line.Amount.ToString("C")</td>
@@ -205,7 +205,7 @@
                         <td>
                             <a asp-controller="Bills" asp-action="Details" asp-route-id="@bill.Id">@bill.BillNumber</a>
                         </td>
-                        <td class="text-muted small">@(bill.DueDate?.ToString("MMM d, yyyy") ?? "—")</td>
+                        <td class="text-muted small">@(bill.DueDate?.ToString("MMM d, yyyy") ?? "&mdash;")</td>
                         <td class="text-end">@bill.BalanceDue.ToString("C")</td>
                         <td class="text-end" style="width:150px">
                             <form asp-action="Apply" method="post" class="d-inline">