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/Shared/_AiQuickQuoteWidget.cshtml

@@ -39,7 +39,7 @@
                           class="form-control form-control-sm"
                           rows="4"
                           maxlength="600"
-                          placeholder="e.g. 4 car wheels done in Alexandrite with an Alien Silver base, about 18 inch diameter…"></textarea>
+                          placeholder="e.g. 4 car wheels done in Alexandrite with an Alien Silver base, about 18 inch diameter&hellip;"></textarea>
             </div>
 
             <div class="row g-2 mb-3">
@@ -110,7 +110,7 @@
                     Reference <span class="text-muted">(caller name or memo)</span>
                 </label>
                 <input type="text" id="qq-reference" class="form-control form-control-sm"
-                       placeholder="e.g. John – 4 wheels" maxlength="100" />
+                       placeholder="e.g. John &ndash; 4 wheels" maxlength="100" />
             </div>
 
             <div id="qq-save-error" class="alert alert-danger alert-permanent d-none py-2 mb-2" style="font-size:0.82rem;"></div>
@@ -130,7 +130,7 @@
             <div class="qq-typing-dot"></div>
             <div class="qq-typing-dot"></div>
             <div class="qq-typing-dot"></div>
-            <span class="ms-2 text-muted" style="font-size:0.82rem;">Analyzing…</span>
+            <span class="ms-2 text-muted" style="font-size:0.82rem;">Analyzing&hellip;</span>
         </div>
     </div>
 </div>