refactor: remove unnecessary DOMContentLoaded wrappers

Since main.js has 'defer' attribute, the DOM is guaranteed to be
ready when modules execute. These wrappers are unnecessary.

dashboard.ts:
- Removed DOMContentLoaded wrapper, code runs directly
- Event delegation setup runs immediately

custom-section-builder.ts:
- Removed DOMContentLoaded wrapper
- initCustomSectionBuilder() called directly

toast.ts:
- Removed DOMContentLoaded wrapper
- initializeToastSystem() called directly at top level
- Removed dead Alpine.data registration (unused)

search.ts:
- Removed DOMContentLoaded wrapper
- initializeSearch exported for use in header

theme.ts:
- Removed DOMContentLoaded wrapper
- Functions now exported for use in header Alpine component

web/src/theme.ts

@@ -202,24 +202,15 @@ const updateWoodPanelingIndicators = (): void => {
   });
 };
 
-// Auto-initialize when DOM is ready
-if (typeof document !== "undefined") {
-  if (document.readyState === "loading") {
-    document.addEventListener("DOMContentLoaded", () => {
-      initializeTheme();
-      loadWoodPaneling();
-      updateWoodPanelingIndicators();
-    });
-  } else {
-    initializeTheme();
-    loadWoodPaneling();
-    updateWoodPanelingIndicators();
-  }
-}
-
 Alpine.data("theme", () => ({
+  applyTheme,
   changeTheme,
   changeWoodPaneling,
+  initializeTheme,
+  loadTheme,
+  loadUserTheme,
+  loadWoodPaneling,
+  updateWoodPanelingIndicators,
 }));
 
 export {