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/BannedIps/Index.cshtml

@@ -248,7 +248,7 @@
                             {
                                 <tr class="text-muted">
                                     <td><code>@ban.IpAddress</code></td>
-                                    <td><small>@(ban.Reason ?? "—")</small></td>
+                                    <td><small>@(ban.Reason ?? "&mdash;")</small></td>
                                     <td><small>@ban.BannedAt.ToString("MMM dd, yyyy")</small></td>
                                     <td>
                                         @if (!ban.IsActive)