fix: remove manual css/js references from shell.ui and load_path.py

- Remove Html widget in shell.ui that manually loaded shell_theme.css/js
  (ahserver auto-serves wwwroot js/css files)
- Remove shell_theme.css/js from load_path.py permission list
  (ahserver handles static resources automatically)

scripts/load_path.py

@@ -31,10 +31,8 @@ paths = [
     # Menu — must be any so unauthenticated users can see nav
     ("/dashboard_for_sage/menu.ui", "any"),
 
-    # Shell / theme files — CSS/JS must be 'any' (static resources loaded before auth)
+    # Shell
     ("/dashboard_for_sage/shell.ui", "logined"),
-    ("/dashboard_for_sage/shell_theme.css", "any"),
-    ("/dashboard_for_sage/shell_theme.js", "any"),
 
     # Global menu
     ("/dashboard_for_sage/global_menu.ui", "logined"),

wwwroot/shell.ui

@@ -6,12 +6,6 @@
         "bgcolor": "#0B1120"
     },
     "subwidgets": [
-        {
-            "widgettype": "Html",
-            "options": {
-                "html": "<link rel=\"stylesheet\" href=\"/dashboard_for_sage/shell_theme.css\"><script src=\"/dashboard_for_sage/shell_theme.js\"><\\/script>"
-            }
-        },
         {
             "widgettype": "HBox",
             "options": {