Mac-matched design and a sidebar you arrange

Added

• Pin folders to the top of the sidebar, and drag them or use Move Up / Move Down to set your own order.
• Rename a folder, reveal it in File Explorer, or copy its path from the folder's menu.

Changed

• Match the Mac app's design: tighter controls and type, a brighter sidebar, one style for menus, popovers, tooltips and dialogs, and right-click menus on workspaces, agents and panes.
• Find Plugins inside Settings, set reasoning effort with a slider, read replies with proper headings and code blocks, and browse Files as a tree with syntax highlighting.
• Take Bridge calls in a floating orb you can drag anywhere, see Restore on the window button when maximized, and open the launch and sign-in screens in your chosen light or dark theme.
• Keep folders in a steady order instead of jumping the last-opened one to the top, and keep a collapsed folder collapsed until you start a session in it.
• Shorten long folder and session names in the middle so similar names stay distinguishable, and show moved or deleted folders in a warning color.

Fixed

• Keep one title bar in narrow windows, float the sidebar over your work, snap to half a laptop screen, and fit the window when zoomed in instead of pushing the window controls off-screen.
• Fit Threads, Tasks, Usage, Plugins, Settings and split panes to narrow windows and high zoom: composer pickers compact, the Changes panel floats over a narrow thread, task details stack, and every split pane stays reachable.
• Style the Agent terminal page before Code mode has been opened, and keep the slashes in changed-file paths.