Polish pass 2: sidenav radius + More prompts match featured chip

[blove]

Summary

• Sidenav: New chat + New project border-radius drops from `9999px` → `8px` to match Search button + thread items (collapsed-mode 10px icon-square unchanged).
• Demo: `` adds scoped `::ng-deep` overrides so the "More prompts" trigger picks up the featured-chip styling — same bg, border, padding, radius, height. chat-select primitive is untouched, so the model picker is unaffected.
• @ngaf/* 0.0.38.

Test plan

• `pnpm nx test chat` — 767 tests pass
• `pnpm nx test examples-chat-angular` — 17 tests pass
• Local chrome-mcp verify: New chat/New project radius=8px, More prompts matches chip pixel-for-pixel (height 38.5px, padding 10/16, surface bg, 1px separator border, 9999px radius)
• Canonical demo redeploys; both fixes visible on demo.cacheplane.ai

🤖 Generated with Claude Code

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 18, 2026 4:29pm