feat(Notepad): Complete refactor - New popout mode & settings

- Add a full popout Notepad experience w/new layout settings
- New ability to choose the left or right side of the screen
- Add more safegaurds to preserve user data throughout
- New banner to show file reload/conflict handling
- New extensionless file support
- Polish settings with gap controls, compact buttons, and shortcuts help

quickshell/DMSShellIPC.qml

@@ -373,6 +373,10 @@ Item {
         }
 
         function open(): string {
+            if (SettingsData.notepadDefaultMode === "popout") {
+                PopoutService.openNotepadPopout();
+                return "NOTEPAD_OPEN_SUCCESS";
+            }
             var instance = getActiveNotepadInstance();
             if (instance) {
                 instance.show();
@@ -391,6 +395,10 @@ Item {
         }
 
         function toggle(): string {
+            if (SettingsData.notepadDefaultMode === "popout") {
+                PopoutService.toggleNotepadPopout();
+                return "NOTEPAD_TOGGLE_SUCCESS";
+            }
             var instance = getActiveNotepadInstance();
             if (instance) {
                 instance.toggle();