- Add dedicated assistant-item layout in WorkspaceItem with avatar, collapse toggle, and separate menu
- Add full assistant-item SCSS block with independent styles (not shared with pro workspace)
- Redesign TodoWriteDisplay: dashed-line header, centered pill, compact track dots, all-completed green state
- Remove stderr border-left from GitToolDisplay
- NavPanel layout tweaks: margin/padding normalization, mode-switch label font size and nowrap
- WorkspaceBody: add gap between layout columns
- Rename 'Pro Mode' to 'Expert Mode' in en-US locales (common.json, flow-chat.json)
- Update README.md and README.zh-CN.md: new tagline, dual-mode section, remote control section, ecosystem table, platform support table, website badge