Fase 3 feedback round 2: live color preview, bigger top icon, dashboard links

- Style preview now updates immediately when picking a color via the
  colorpicker widget. It sets the input value through jQuery's synthetic
  trigger(), which a native addEventListener('change', ...) never sees -
  bound the listener through jQuery instead so both native and
  colorpicker-driven changes refresh the preview.
- Icon-above-QR max height raised from 25% to 62.5% of QR height (~2.5x
  bigger per feedback); the existing 60%-width cap now becomes the
  practical limit for most icons. Verified generated QR still decodes.
- Dashboard's "Dynamic Qr codes" and "Static QR codes" info-boxes now link
  to their list pages. "Total qr codes"/"Total Scans" left as-is - no
  combined-list or scan-report page exists yet to link them to.
- Random-style button now has a "Randomize" label to match its row-mates
  (Load preset/Save as preset/Style preview), instead of an empty spacer.

src/lib/Qrcode/Qrcode-intchil.php

@@ -174,7 +174,7 @@ class Qrcode {
         $iconWidth = imagesx($icon);
         $iconHeight = imagesy($icon);
 
-        $maxIconHeight = (int) ($height * 0.25);
+        $maxIconHeight = (int) ($height * 0.625);
         $scale = min($maxIconHeight / $iconHeight, ($width * 0.6) / $iconWidth, 1);
         $targetWidth = max(1, (int) ($iconWidth * $scale));
         $targetHeight = max(1, (int) ($iconHeight * $scale));