v3.7.0 — Rounded cards + collapsible log

What's new

Changed

• Rounded cards — all content cards now use a Canvas-based `RoundedCard` with smooth 12 px corner curves. The border accent color changes when a card is actively running.
• Collapsible log — log is collapsed by default when empty. Click ▸ Log header to expand. A blue count badge `● N` appears on the header when new messages arrive while collapsed. Clearing the log auto-collapses it.