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/EmailBroadcast/Preview.cshtml

@@ -1,4 +1,4 @@
-@using PowderCoating.Web.Controllers
+@using PowderCoating.Web.Controllers
 @model AdminEmailPreviewModel
 @{
     ViewData["Title"] = "Preview Admin Email";
@@ -78,7 +78,7 @@
                                     <div class="small text-muted">@(string.IsNullOrWhiteSpace(row.RecipientEmail) ? "No primary contact email configured" : row.RecipientEmail)</div>
                                 </td>
                                 <td>
-                                    <div>@(string.IsNullOrWhiteSpace(row.CompanyAdminName) ? "—" : row.CompanyAdminName)</div>
+                                    <div>@(string.IsNullOrWhiteSpace(row.CompanyAdminName) ? "&mdash;" : row.CompanyAdminName)</div>
                                     @if (!string.IsNullOrWhiteSpace(row.CompanyAdminEmail))
                                     {
                                         <div class="small text-muted">@row.CompanyAdminEmail</div>