fix: PHP upload limits, import error dialog, earlier footer breakpoint

- Set upload_max_filesize=64M and display_errors=0 for Electron PHP
- Import shows error dialog instead of silently failing
- Footer count repositions at 1450px instead of 1250px

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/css/style.css

@@ -28,7 +28,7 @@ body.no-scanlines::after { display: none !important; }
 #main-header { box-shadow: var(--ui-shadow-header); }
 #main-footer { box-shadow: var(--ui-shadow-footer); position: relative; }
 #footer-count { flex-shrink: 0; }
-@media (min-width: 1250px) {
+@media (min-width: 1450px) {
     #footer-count { position: absolute; left: 50%; translate: -50% 0; }
 }
 html { min-width: 1150px; }