Motivation

• Initial page rendering was being blocked by third-party network handshakes and synchronous script loads, causing slow perceived load times.
• Reduce render-blocking on first paint and shorten network handshake latency for CDN and Supabase hosts.

Description

• Added link rel="preconnect" and link rel="dns-prefetch" hints for https://cdn.jsdelivr.net and the Supabase host (https://pqvdexhxytahljultmjd.supabase.co) into the app HTML shells.
• Added defer to the Supabase SDK script (https://cdn.jsdelivr.net/npm/@supabase/supabase-js@2) across the main HTML files to avoid blocking parsing.
• Added defer to the LiveKit vendor client script (vendor/livekit-client.umd.js) on the live page to postpone execution until after parsing.
• Changes were applied to multiple static HTML files such as index.html, live_class.html, classes.html, class_detail.html, create_class.html, login.html, signup.html, settings.html, logout.html, student_dashboard.html, and teacher_dashboard.html.

Testing

• No automated tests were executed for these static HTML changes.
• Changes are limited to non-functional, performance-oriented HTML hints and defer attributes only, so no runtime unit tests were run.

Codex Task