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/AccountDataExport/Index.cshtml

@@ -72,14 +72,14 @@
                         <input class="form-check-input" type="radio" name="format" value="xlsx" id="fmt_xlsx" checked />
                         <label class="form-check-label" for="fmt_xlsx">
                             <i class="bi bi-file-earmark-spreadsheet me-1 text-success"></i>
-                            Excel (.xlsx) — all sheets in one file
+                            Excel (.xlsx) &mdash; all sheets in one file
                         </label>
                     </div>
                     <div class="form-check">
                         <input class="form-check-input" type="radio" name="format" value="csv" id="fmt_csv" />
                         <label class="form-check-label" for="fmt_csv">
                             <i class="bi bi-file-zip me-1 text-warning"></i>
-                            CSV (.zip) — one file per sheet
+                            CSV (.zip) &mdash; one file per sheet
                         </label>
                     </div>
                 </div>
@@ -111,7 +111,7 @@
         document.getElementById('exportForm').addEventListener('submit', function () {
             var btn = document.getElementById('exportBtn');
             btn.disabled = true;
-            btn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>Generating…';
+            btn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>Generating&hellip;';
             // Re-enable after 10s in case browser blocks the download dialog
             setTimeout(function () {
                 btn.disabled = false;