App tree: keep expanded folders open; only the - sign closes one

Rebuilding the tree (live child loads, edits) now restores every row that
was expanded, matched by component id or name path. Double-click no longer
toggles a row through ttk's default binding.

Co-Authored-By: Claude Opus 5.5 <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 = "0.0.0.147"
+VERSION = "0.0.0.148"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True