v4: news cards CSS styling

Restore src/style.css to commit 816c981d state

Feat: 10 news cards from 17 RSS, click-to-summarize, news hook in greeting, fix avatar hang

Add 5 hot news cards from 10 RSS sources under avatar responses, TTS never reads news

Restore: src/style.css to commit 186d7cb

Add: CSS cho .chat-link hiển thị đẹp, clickable, mở popup

Restore style.css to commit 14581f08 (draggable/resizable text chat, no text-chat-row/avatar-loading)

Add proper CSS for text chat and avatar loading overlay

Restore src/style.css from victor/gemma-avatar

Upload src/style.css