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/Reports/PowderUsage.cshtml

@@ -79,8 +79,8 @@
                             <td>
                                 @item.DisplayLabel
                             </td>
-                            <td class="text-muted small">@(item.SKU ?? "—")</td>
-                            <td class="text-muted small">@(item.Manufacturer ?? "—")</td>
+                            <td class="text-muted small">@(item.SKU ?? "&mdash;")</td>
+                            <td class="text-muted small">@(item.Manufacturer ?? "&mdash;")</td>
                             <td class="text-end fw-semibold">@item.TotalLbsUsed.ToString("N1")</td>
                             <td class="text-end">@item.TotalCost.ToString("C")</td>
                             <td class="text-end">@item.JobCount</td>