Add copy button to Star Wars Style Journal

- Added a copy button to the Star Wars Style Journal sheet.
- The copy button allows users to easily copy the content of the journal (in markdown format via turndown) to their clipboard.
- A notification is displayed upon successful copying.

src/scripts/journalSheets.js

@@ -1,3 +1,5 @@
+var turndownService = new TurndownService()
+
 export class StarWarsStyleJournalSheet extends JournalSheet {
   static get defaultOptions() {
     return mergeObject(super.defaultOptions, {
@@ -7,6 +9,8 @@ export class StarWarsStyleJournalSheet extends JournalSheet {
   async _render(force, options) {
     await super._render(force, {...options, collapsed:true});
   }
+
+
 }
 
 export class StarWarsTextPageSheet extends JournalTextPageSheet {
@@ -18,4 +22,33 @@ export class StarWarsTextPageSheet extends JournalTextPageSheet {
       resizable: true,
     });
   }
+  activateListeners(html) {
+    super.activateListeners(html);
+    // Ensure the button is not duplicated
+    if (html.find(".asc-copy-button").length > 0) return;
+
+    // Create the button element
+    const button = $(`<div class="asc-copy"><button><i class="fas fa-clipboard"></i>Copy</button></div>`);
+
+    // Insert it inside the .journal-header
+    const journal_header = html.find(".journal-header aside")
+    journal_header.append(button);
+
+    // Attach event listener
+    button.click(this._onCopyButtonClick.bind(this));
+  }
+
+  _onCopyButtonClick(event) {
+    event.preventDefault();
+    var editorContent = this.element.find(".editor-content").html();
+
+    // Replace linked items
+    editorContent = editorContent.replace(/@\w+\[.+\]\{(.*?)\}/g,"$1")
+    
+    const markdownContent = turndownService.turndown(editorContent)
+
+    // Copy to clipboard
+    navigator.clipboard.writeText(markdownContent)
+    .then(()=>ui.notifications.info("Journal content copied as Markdown!"));
+  }
 }