Fase 3 feedback round: style preview, icon upload, font choice, optional bitcoin amount, WPA3

- Default the Owner select to the creator's own account instead of "All", so
  superadmin-created codes no longer silently become visible to every admin
  (the underlying NULL-fallback sharing behavior for an explicit "All" choice
  is unchanged).
- Add a live color/precision/size preview swatch next to the preset picker.
- Let the frame text use a chosen DejaVu font + font size instead of a fixed
  GD bitmap font.
- Add an optional self-uploaded icon rendered above the qr code (not embedded
  in it, so scanability is unaffected).
- Make the Bitcoin qr amount optional; a standing wallet address is useful
  without forcing a one-off amount per code.
- Add a WPA3 option to the WiFi qr encryption select.
- Fix a real bug surfaced while testing the preview/style JS: qrcode_options.php
  was included once per static qr type (16 times on one page) and each
  inclusion re-executed <script src="qrcode-style-tools.js">, so every button
  click fired once per type - e.g. saving one preset wrote 16 duplicate rows,
  and every tab except the first ("Text") had dead random-style/preset
  buttons since only the first DOM match ever got a listener. Moved the
  script include to load once per page and rewrote the JS to scope every
  lookup to the triggering element's own tab-pane/form instead of relying on
  getElementById's first-match behavior.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0196bLhZhuxwK3MkHuKLe5WB

src/forms/form_dynamic_add.php

@@ -54,6 +54,7 @@
     <div class="col-sm-12 mb-2">
         <div class="row">
             <div class="col-6 col-md-3">
+                <label>&nbsp;</label>
                 <button type="button" id="random_style_btn" class="btn btn-outline-secondary btn-block">
                     <i class="fa fa-dice"></i> Random style
                 </button>
@@ -80,6 +81,14 @@
                     </div>
                 </div>
             </div>
+
+            <div class="col-6 col-md-3">
+                <label>Style preview</label>
+                <div id="style_preview" class="d-flex align-items-center">
+                    <span id="style_preview_swatch" style="display:inline-block;width:38px;height:38px;border:3px solid #000;background:#fff;border-radius:4px;"></span>
+                    <small id="style_preview_text" class="ml-2 text-muted"></small>
+                </div>
+            </div>
         </div>
     </div>
 
@@ -136,6 +145,35 @@
             <small class="form-text text-muted">Optional label rendered below the code. Only applies to PNG/JPEG/GIF, not SVG/EPS.</small>
         </div>
     </div>
+
+    <div class="col-6 col-md-2">
+        <div class="form-group">
+            <label for="frame_font">Frame font</label>
+            <select name="frame_font" id="frame_font" class="form-control">
+                <option value="sans" selected>Sans</option>
+                <option value="sans-bold">Sans Bold</option>
+                <option value="serif">Serif</option>
+                <option value="serif-bold">Serif Bold</option>
+                <option value="mono">Monospace</option>
+                <option value="mono-bold">Monospace Bold</option>
+            </select>
+        </div>
+    </div>
+
+    <div class="col-6 col-md-2">
+        <div class="form-group">
+            <label for="frame_font_size">Frame font size</label>
+            <input type="number" name="frame_font_size" id="frame_font_size" value="16" min="8" max="60" class="form-control">
+        </div>
+    </div>
+
+    <div class="col-sm-4">
+        <div class="form-group">
+            <label for="icon">Icon above QR code</label>
+            <input type="file" name="icon" id="icon" accept="image/png,image/jpeg,image/gif" class="form-control-file">
+            <small class="form-text text-muted">Optional. PNG/JPEG/GIF, max 1MB. Shown above the code (not embedded in it). Only applies to PNG/JPEG/GIF output.</small>
+        </div>
+    </div>
   </div>
 </div>
 
@@ -146,7 +184,7 @@
                 <div class="form-group">
                     <label for="id_owner">Owner *</label>
                     <select name="id_owner" class="form-control">
-                        <option value="" selected>All</option>
+                        <option value="">All (shared with every admin)</option>
                         <?php
 
                         require_once BASE_PATH . '/lib/Users/Users.php';
@@ -154,8 +192,9 @@
                         $users = $users_instance->getAllUsers();
 
                         foreach ($users as $user) {
+                            $is_self = (int) $user["id"] === (int) $_SESSION["user_id"];
                         ?>
-                        <option value="<?php echo $user["id"];?>"><?php echo $user["username"];?></option>
+                        <option value="<?php echo $user["id"];?>" <?php echo $is_self ? 'selected' : ''; ?>><?php echo $user["username"];?></option>
                         <?php } ?>
                     </select>
                 </div>