fix: keep typewriter effect for non-streaming chunks

fix: make surprise me always generate fresh prompt

feat: add AI-powered surprise prompt generation

feat: add generate icon button and rebalance mobile composer controls

feat: refresh pwa icons

fix: avoid vercel generate crash by using server-safe constants module

feat: strengthen prompt generation stability and skills integration

Fix service worker response clone race in cache flow

Harden API security limits and auth controls

Harden Vercel generate function runtime for stability

Add Vercel serverless API routes for generate and skills status

feat: add CORS allowlist for prompt-arcgent vercel origin

docs: refresh README and remove AI Studio banner

feat: implement prompt generator improvements and PWA support