Create the shared themes folder with the built-in themes

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Settings.py

@@ -8,8 +8,8 @@ from typing import Callable
 import flet as ft
 
 from Core import (
-    AppConfig, BundledFontFamily, ChildEnvironment, ChipButtonStyle, IsWindows, LoadSharedSettings, Palette,
-    SharedSettings, ThemesDir,
+    AppConfig, BundledFontFamily, ChildEnvironment, ChipButtonStyle, EnsureSharedThemes, IsWindows,
+    LoadSharedSettings, Palette, SharedSettings, ThemesDir,
 )
 from Installer import DefaultAnswers, DefaultOptions
 from Manifests import Program
@@ -25,8 +25,9 @@ def _Note(Text: str) -> ft.Text:
 
 
 def _Themes() -> list[str]:
+    EnsureSharedThemes()
     Names = {Path.stem for Path in ThemesDir.glob("*.toml")} if ThemesDir.is_dir() else set()
-    Names.add("CatppuccinMocha")  # built in, even before SaraFem seeds the folder
+    Names.add("CatppuccinMocha")  # built in, even where the folder can't be written
     return sorted(Names)