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/Index.cshtml

@@ -73,7 +73,7 @@
             <div class="col-md-4">
                 <label class="form-label small mb-1">Search</label>
                 <input name="search" value="@search" class="form-control form-control-sm"
-                       placeholder="Customer, memo #, or reason…" />
+                       placeholder="Customer, memo #, or reason&hellip;" />
             </div>
             <div class="col-md-3">
                 <label class="form-label small mb-1">Status</label>
@@ -204,7 +204,7 @@ else
                             </td>
                             <td>@m.IssueDate.ToLocalTime().ToString("MM/dd/yyyy")</td>
                             <td class="@(expired ? "text-danger fw-semibold" : "")">
-                                @(m.ExpiryDate.HasValue ? m.ExpiryDate.Value.ToLocalTime().ToString("MM/dd/yyyy") : "—")
+                                @(m.ExpiryDate.HasValue ? m.ExpiryDate.Value.ToLocalTime().ToString("MM/dd/yyyy") : "&mdash;")
                                 @if (expired) { <small>(Expired)</small> }
                             </td>
                             <td>