Add displaylocations, location/inspection migrations, UI refinements

- New displaylocations.asp (production location listing)
- 3 new SQL migrations: inspection machine type, location relationship
  types, pctype inspection update
- displaymachine.asp / printbadge.asp substantial rework
- editmachine/editpc/savemachineedit: ~50 line additions each
- Dashboard index.html + tv-dashboard tweaks
- .gitignore: block database-backup-*.sql, *.bak, *.pdf

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tv-dashboard/index.html

@@ -139,6 +139,10 @@
         function showError(message) {
             document.getElementById('slideshow').innerHTML =
                 '<div class="error-message"><h2>Display Error</h2><p>' + message + '</p></div>';
+            // Clear slides so the next successful fetch always re-renders
+            slides = [];
+            currentSlide = 0;
+            if (slideTimer) { clearTimeout(slideTimer); slideTimer = null; }
         }
 
         function startSlideshow() {