v2.0.0-beta.4

workroom 2.0 beta 4 — split terminal panes

This beta brings split terminal panes to the macOS app, plus a clearer picture of
what each terminal is doing while it runs.

⚠️ This is a beta — expect rough edges.

macOS app

• Split terminal panes — split any terminal into multiple panes, move between them
  with the keyboard, and split or open terminals straight from a right-click menu
• Live activity at a glance — terminal progress now animates in the sidebar and tab
  strip, driven by the shell's OSC 9;4 progress reports rather than the command title
• Setup overlay — new workrooms block the terminal behind a progress overlay until
  your setup script finishes, then open ready to use
• Confirm before closing a terminal — optional guard so you don't lose a running
  session by accident

Fixes

• Sidebar expand/collapse now commits on click instead of on mouse-move
• The busy spinner no longer sticks on for deep-cwd terminals
• App build targets always run xcodegen

Under the hood

• RootView and WorkroomTerminalsView split into focused view files
• Split-pane UI tests run on injected fixtures, with a11y/animation polish; headless CI
  teardown crash fixed; swift-format lint cleaned up