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/JournalEntries/Details.cshtml

@@ -119,7 +119,7 @@
                         <dt class="col-5 text-muted">Posted</dt>
                         <dd class="col-7 small">
                             @Model.PostedAt.Value.ToLocalTime().ToString("MMM d, yyyy h:mm tt")<br />
-                            <span class="text-muted">by @(Model.PostedBy ?? "—")</span>
+                            <span class="text-muted">by @(Model.PostedBy ?? "&mdash;")</span>
                         </dd>
                     }
                     <dt class="col-5 text-muted">Created</dt>