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/SystemInfo/Index.cshtml

@@ -7,7 +7,7 @@
 
 @section Styles {
 <style>
-    /* Dark mode: bg-warning text-dark badge — keep text readable */
+    /* Dark mode: bg-warning text-dark badge &mdash; keep text readable */
     [data-bs-theme="dark"] .badge.bg-warning.text-dark {
         color: #fff !important;
     }
@@ -97,7 +97,7 @@
                         </tr>
                         <tr>
                             <th class="ps-4">Last Migration</th>
-                            <td><small class="text-muted font-monospace">@(Model.LastAppliedMigration ?? "—")</small></td>
+                            <td><small class="text-muted font-monospace">@(Model.LastAppliedMigration ?? "&mdash;")</small></td>
                         </tr>
                         <tr>
                             <th class="ps-4">Last Seed Run</th>