v0.9.0: UX Polish

UX Polish

• Scroll animations: IntersectionObserver fade/slide on all landing page sections
• Mobile nav: hamburger drawer with backdrop, escape key, body scroll lock, active dot indicator
• Active nav indicator: underline on current route in desktop navbar
• 404 page: proper NotFoundPage with home and status links
• Blog reading experience: estimated read time, sticky orange progress bar, breadcrumb
• Live metrics pulse: ping animation fires on each data update
• Pricing toggle: price number animates on billing period switch
• Consistent page heroes: standardized pt-36 pb-16 and typography across all public pages
• Sidebar: increased top padding and item spacing
• Alerts product card marked live