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/CreditMemos/Details.cshtml

@@ -181,7 +181,7 @@
                                         </td>
                                         <td>@a.AppliedDate.ToLocalTime().ToString("MM/dd/yyyy")</td>
                                         <td class="text-end fw-semibold text-success">@a.AmountApplied.ToString("C")</td>
-                                        <td class="small text-muted">@(a.AppliedBy?.FullName ?? "—")</td>
+                                        <td class="small text-muted">@(a.AppliedBy?.FullName ?? "&mdash;")</td>
                                     </tr>
                                 }
                             </tbody>
@@ -220,12 +220,12 @@
                             <div class="mb-3">
                                 <label class="form-label">Select Invoice</label>
                                 <select name="invoiceId" id="applyInvoiceId" class="form-select" required>
-                                    <option value="">— choose invoice —</option>
+                                    <option value="">&mdash; choose invoice &mdash;</option>
                                     @foreach (var inv in openInvoices)
                                     {
                                         <option value="@inv.Id"
                                                 data-balance="@inv.BalanceDue.ToString("F2")">
-                                            @inv.InvoiceNumber — Due @inv.BalanceDue.ToString("C")
+                                            @inv.InvoiceNumber &mdash; Due @inv.BalanceDue.ToString("C")
                                             @if (inv.DueDate.HasValue && inv.DueDate.Value < DateTime.UtcNow)
                                             { <text>(Overdue)</text> }
                                         </option>