baguette v0.1.91

Added

• Companion screens rail. A rail on the right edge of /simulators/<udid>
  offering the screens a simulator can show beside its own: its CarPlay /
  external display, and the Apple Watch paired with it. A screen the host
  doesn't have keeps its slot and says how to get one, an unbooted watch gets a
  Boot button, and a missing CarPlay display gets a button that drives
  Simulator.app's menus for you. The rail re-probes on focus, since attaching
  happens in another app; open panes survive a reload. New routes: GET /simulators/:udid/companion-screens.json, POST /simulators/:udid/carplay-display. See
  docs/features/companion-screens.md.
• Digital Crown and Side button, under the watch pane. A watch has no bezel
  chrome to hang overlay buttons off, so without them the only way out of an app
  was to already know the crown exists. Scroll by dragging on the face — the
  crown's rotation is a separate HID axis baguette doesn't drive.

Fixed

• Touching an external display pane restarted the simulator. The target came
  from IndigoHIDTargetForScreen, which returns a plausible number no service
  has registered — and the CarPlay digitizer had never been created either.
  Unregistered targets make the guest throw and take SpringBoard with it, so
  targets are constants now and the service is created before use, removed on
  teardown, and failed closed if it can't be made.
• Opening a device's tab attached a CarPlay display to it. The pane mounted
  unconditionally and ?display=carplay asks the host to enable CarPlay, so
  merely looking at a simulator turned one on.
• The CarPlay pane was a black rectangle with no explanation. Availability
  came from a name in Connected Screens, but a display can be registered with no
  framebuffer behind it. It's the same Display.resolve() the stream performs
  now, and a stream that fails to bind renders the error under the pane instead
  of logging it to the console.
• The pane called itself CarPlay while showing any external display. It binds
  the best external, and the External Displays menu offers plain resolutions
  too — which on an iOS 27 beta attach and stream while CarPlay attaches nothing.
• External displays were bound by area alone. Anything above 800 × 480 × 4
  was refused outright, so a 1080p display reported "nothing attached"; with the
  bound lifted, a 4K one then out-measured the phone and took the device plane,
  putting both planes on the wrong port. The device plane is picked by shape now,
  area only as the tie-break, and landscape means strictly wider than tall.
• Two-finger gestures from the browser were built on the wrong thread.
  IndigoHIDMessageForMouseNSEvent reads NSEvent thread-local state, so it must
  be built on the main actor. The POST …/input route always hopped; the stream
  socket — the path the browser's pinch and two-finger pan actually ride — did
  not, and produced messages the simulator silently drops.
• The device rendered at half size when nothing was beside it. The phone was
  pinned to 46vw at every width for the CarPlay pane's benefit, and the
  narrow-window rule meant to relax that lost silently to it. Pane sizing is one
  set of variables now, reacting to window width and how many panes are open.

What's Changed

• feat: companion screens rail with carplay and paired watch support by @crockalet in #47

Full Changelog: v0.1.90...v0.1.91