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/Maintenance/Index.cshtml

@@ -29,7 +29,7 @@
     <div class="alert alert-warning alert-permanent d-flex justify-content-between align-items-center mb-3">
         <div>
             <i class="bi bi-funnel-fill me-2"></i>
-            Showing <strong>@Model.TotalCount</strong> pending maintenance record@(Model.TotalCount == 1 ? "" : "s") — Scheduled, In Progress, or Overdue
+            Showing <strong>@Model.TotalCount</strong> pending maintenance record@(Model.TotalCount == 1 ? "" : "s") &mdash; Scheduled, In Progress, or Overdue
         </div>
         <a href="@Url.Action("Index")" class="btn btn-sm btn-outline-secondary">
             <i class="bi bi-x me-1"></i>Show All