v0.5.1

Changed

• Hover/active on Button, Menu, Dropdown, Select, pickers, Pagination, and Tag uses ink tint (ink-hover / ink-active) instead of gray/frost overlays. Menu highlight is ink, not a glass chip.
• Segmented uses a sliding glass thumb on a frosted track.
• Splitter gutter is a 1px line that thickens on hover/drag; the center handle pill is gone.
• AgentChatbox / AgentPanel column is slightly wider. AgentChatbox composer padding is tighter. Default ChatToolCall icon is a code block.

Fixed

• ChatInput textarea height no longer stays stretched after collapse; it remeasures when the composer width changes.