Bug fixes and performance improvements.

We've been hard at work improving the experience from the ground up. This update brings secure sign-in, richer learning content, and a more polished feel throughout the app. • Sign In & Security You can now create an account and sign in securely. Your progress, reflections, and achievements are saved and synced — so your growth follows you everywhere. • Achievements Earn recognition as you grow. A new Achievements section celebrates your milestones and keeps you motivated throughout your learning journey. • Lesson Titles Every lesson now has a clear, descriptive title — so you always know exactly what you're working on and where you're headed. • Rich Text Support Lesson content is now beautifully formatted with full Markdown rendering, making complex topics easier to read, absorb, and act on. • Lesson Materials Each lesson now includes curated reference materials to help you go deeper. Links have been carefully reviewed to ensure they're accurate and relevant