Move widget tree pane to the right side of Page Editor

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.120"
+VERSION = "0.0.0.121"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True

ox_page_view.py

@@ -203,14 +203,14 @@ class OxPageViewPanel:
         body = ttk.PanedWindow(self.frame, orient=tk.HORIZONTAL)
         body.pack(fill=tk.BOTH, expand=True)
 
-        tree_frame = ttk.Frame(body)
-        self._build_widget_tree(tree_frame)
-        body.add(tree_frame, weight=0)
-
         canvas_frame = ttk.Frame(body)
         self._build_canvas(canvas_frame)
         body.add(canvas_frame, weight=1)
 
+        tree_frame = ttk.Frame(body)
+        self._build_widget_tree(tree_frame)
+        body.add(tree_frame, weight=0)
+
     def _build_widget_tree(self, parent):
         ttk.Label(parent, text="Widgets", font=("TkDefaultFont", 9, "bold")).pack(
             anchor="w", padx=4, pady=(4, 2))