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/forms/qrcode_options.php

@@ -58,7 +58,7 @@ if (QRCODE_GENERATOR === "internal-chillerlan.qrcode") {
     <div class="col-sm-12 mb-2">
         <div class="row">
             <div class="col-6 col-md-3">
-                <label>&nbsp;</label>
+                <label>Randomize</label>
                 <button type="button" id="random_style_btn" class="btn btn-outline-secondary btn-block">
                     <i class="fa fa-dice"></i> Random style
                 </button>