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/Budgets/Index.cshtml

@@ -78,7 +78,7 @@ else
                                 </td>
                                 <td class="text-center">@b.Lines.Count</td>
                                 <td class="text-end text-success">@b.Lines.Sum(l => l.Annual).ToString("C")</td>
-                                <td class="text-end text-danger">—</td>
+                                <td class="text-end text-danger">&mdash;</td>
                                 <td class="text-center">
                                     @if (b.IsDefault)
                                     {