Fix ApplicationV2 jQuery parameter handling in _onRender methods

- Fixed TypeError in PlayerPrivacyPanel._onRender: element.querySelector is not a function
- Root cause: FoundryVTT v14 ApplicationV2 passes jQuery objects to _onRender, not plain HTMLElements
- Solution: Normalize parameter to element with querySelector method:
  - If HTMLElement, use directly
  - If jQuery (has [0]), use html[0]
  - Otherwise, use as-is (for test mocks)
- Applied fix to:
  - PlayerPrivacyPanel._onRender
  - PresetSaveDialog._onRender
  - PresetLoadDialog._onRender
- All 900 unit tests passing

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

src/ui/gm/PresetLoadDialog.js

@@ -89,9 +89,16 @@ export class PresetLoadDialog extends _AppBase {
 
   /**
    * Sets up event handlers after rendering.
-   * @param {HTMLElement} element - The dialog element.
+   * @param {HTMLElement|JQuery|object} html - The dialog element, jQuery object, or plain object with querySelector.
    */
-  _onRender(element) {
+  _onRender(html) {
+    // Normalize html to element with querySelector
+    // FoundryVTT ApplicationV2 passes jQuery object, tests pass plain objects
+    const element = html instanceof HTMLElement 
+      ? html 
+      : (html?.[0] ?? html);
+    if (!element || typeof element.querySelector !== 'function') return;
+
     // Set up load button handlers for each preset
     const loadButtons = element.querySelectorAll('[data-action="load"]');
     loadButtons.forEach((btn) => {

src/ui/gm/PresetSaveDialog.js

@@ -86,9 +86,16 @@ export class PresetSaveDialog extends _AppBase {
 
   /**
    * Sets up event handlers after rendering.
-   * @param {HTMLElement} element - The dialog element.
+   * @param {HTMLElement|JQuery|object} html - The dialog element, jQuery object, or plain object with querySelector.
    */
-  _onRender(element) {
+  _onRender(html) {
+    // Normalize html to element with querySelector
+    // FoundryVTT ApplicationV2 passes jQuery object, tests pass plain objects
+    const element = html instanceof HTMLElement 
+      ? html 
+      : (html?.[0] ?? html);
+    if (!element || typeof element.querySelector !== 'function') return;
+
     // Cache the name input
     this._nameInput = element.querySelector('[name="presetName"]');