fix(ci): resolve e2e and visual test failures

- Fix race condition in UploadModal.js by making open() await load()
- Stabilize notification-system.spec.ts by waiting for app initialization
- Update visual test baselines for default theme
- Complete scheduled style-agent task

Co-authored-by: PR0M3TH3AN <[email protected]>

js/ui/components/UploadModal.js

@@ -1262,7 +1262,8 @@ export class UploadModal {
 
   // --- Modal Control ---
 
-  open({ triggerElement } = {}) {
+  async open({ triggerElement } = {}) {
+    await this.load();
     if (!this.root) return;
     this.root.classList.remove("hidden");
     this.setGlobalModalState("upload", true);