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/Contact/Index.cshtml

@@ -55,7 +55,7 @@
                 </div>
                 <div class="flex-grow-1">
                     <div class="fw-semibold">AI Assistant</div>
-                    <div class="text-muted small">Ask anything — available 24/7 in the bottom-right corner.</div>
+                    <div class="text-muted small">Ask anything &mdash; available 24/7 in the bottom-right corner.</div>
                 </div>
                 <button type="button" class="btn btn-sm btn-outline-success flex-shrink-0"
                         onclick="document.getElementById('aiHelpTrigger')?.click()">
@@ -122,7 +122,7 @@
                         <div class="col-md-6">
                             <label asp-for="Form.Category" class="form-label fw-semibold"></label>
                             <select asp-for="Form.Category" class="form-select">
-                                <option value="">— Select a Category —</option>
+                                <option value="">&mdash; Select a Category &mdash;</option>
                                 @foreach (var cat in ContactFormModel.Categories)
                                 {
                                     <option value="@cat" selected="@(Model.Form.Category == cat)">@cat</option>

src/PowderCoating.Web/Views/Contact/Submissions.cshtml

@@ -105,7 +105,7 @@ else
                                     <div class="mb-0">
                                         <label class="form-label fw-semibold">Admin Note <span class="text-muted fw-normal">(optional)</span></label>
                                         <textarea name="adminNotes" class="form-control" rows="3"
-                                                  placeholder="e.g. Replied via email, escalated to billing, resolved…"></textarea>
+                                                  placeholder="e.g. Replied via email, escalated to billing, resolved&hellip;"></textarea>
                                     </div>
                                 </div>
                                 <div class="modal-footer">