feat: Update Notepad to use Metadata (READ ME)

- Potential breaking changes; SAVE your notes before updating
- The new system will store files locally to free up Session data
- Session metadata will be saved in JSON via: `notepad-session.json`
- Local files will be saved in: `/.local/state/DankMaterialShell/notepad-files`

Modules/TopBar/NotepadButton.qml

@@ -1,5 +1,6 @@
 import QtQuick
 import qs.Common
+import qs.Services
 import qs.Widgets
 
 Rectangle {
@@ -45,7 +46,7 @@ Rectangle {
         anchors.top: parent.top
         anchors.rightMargin: SettingsData.topBarNoBackground ? 0 : 4
         anchors.topMargin: SettingsData.topBarNoBackground ? 0 : 4
-        visible: SessionData.notepadContent.length > 0
+        visible: NotepadStorageService.tabs && NotepadStorageService.tabs.length > 0
         opacity: 0.8
     }
 
@@ -68,4 +69,4 @@ Rectangle {
 
     }
 
-}
+}