feat(Notepad): add notepad desktop entry & IPC commands file handling

quickshell/Modules/Notepad/Notepad.qml

@@ -212,6 +212,25 @@ Item {
         });
     }
 
+    function openExternalFile(path) {
+        if (!path)
+            return;
+
+        for (var i = 0; i < NotepadStorageService.tabs.length; i++) {
+            var tab = NotepadStorageService.tabs[i];
+            if (tab && !tab.isTemporary && tab.filePath === path) {
+                textEditor.autoSaveToSession();
+                switchToTab(i);
+                return;
+            }
+        }
+
+        textEditor.autoSaveToSession();
+        NotepadStorageService.createTabForFile(path);
+        root.currentFileName = path.split('/').pop();
+        root.currentFileUrl = "file://" + path;
+    }
+
     function loadFromFile(fileUrl) {
         if (hasUnsavedChanges()) {
             root.pendingFileUrl = fileUrl;

quickshell/Modules/Notepad/NotepadPopoutWindow.qml

@@ -9,6 +9,7 @@ FloatingWindow {
     id: win
 
     property alias shouldBeVisible: win.visible
+    property alias notepad: notepad
 
     function show() {
         visible = true;