Fix page header placement jump by standardizing container classes

- Changed all notes-related pages to use standard 'page-container' class
- Updated notes_list.html, notes_folders.html, note_editor.html, and note_view.html
- This ensures consistent padding and layout across all pages
- Fixes the visual jump when navigating between Sprints and Notes

templates/note_editor.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="note-editor-container">
+<div class="page-container">
     <!-- Page Header -->
     <div class="page-header">
         <div class="header-content">