Palette: refresh kit list after opening a file

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 = "0.0.0.063"
+VERSION = "0.0.0.064"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True

main.py

@@ -1573,6 +1573,7 @@ def on_tree_filled():
     # The root row is new after every rebuild, so its colour has to be reapplied.
     refresh_dirty_display()
     fit_tree_column(app_state.tree)
+    refresh_palette_kits()
 
     if app_state.current_file_path != _history_file_path:
         _history_file_path = app_state.current_file_path