macos: the AppKit shell, its icon, and the offscreen e2e harness

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diff --git a/test/macos-snapshots/trackpad.snap b/test/macos-snapshots/trackpad.snap
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+# The trackpad features, asserted without a trackpad, plus the rest of the
+# pointer vocabulary.
+#
+# Trackpad.button(fingers:) is pure policy with no NSEvent in it, so a script
+# can name how many fingers were resting and get back the button a hand would
+# have produced: two is acme's button 3 (Look), three or more is button 2
+# (Exec), and a deep press is button 2 by another route. pardes_take_haptic is
+# the other half — it is how the pulse the core armed is read back on a machine
+# with nothing to feel it with.
+#
+# Coordinates are 0-based cells, which is what pardes_mouse takes. The tty
+# suite's press/release are 1-based SGR and so read one higher.
+start 30 100
+wait 8000 New Newcol
+wait 8000 $
+stable 700 20000
+# something to look at; split so the echoed command line is not the match
+text printf 'x MA''RK a\nzz\nx MA''RK b\nzz\nx MA''RK c\n'
+key enter
+wait 10000 MARK c
+stable 700 10000
+# A raw pane hands clicks to the program on the other end. Normal mode is where
+# the three buttons mean Select, Exec and Look.
+key c-b
+stable 600 8000
+snap ready
+# THE ADAPTER ITSELF, before any of the decoded paths below. `nsclick` builds a
+# real NSEvent and hands it to the view's own rightMouseDown, so this is the one
+# command that exercises the code between AppKit and the entry points. It is
+# here because an adapter that silently dropped every mouse event once passed
+# this entire suite: everything else calls the entry points directly.
+nsclick right 4 3
+wait 10000 @p0:
+stable 700 15000
+haptic look
+snap adapter
+# Back to a clean slate for the finger-count cases below.
+haptic none
+# TWO FINGERS RESTING = button 3 = Look. MARK names no file, so looking at it
+# searches, and the hits land in a +Search buffer split under the shell.
+fingers 2 4 3
+wait 10000 @p0:
+stable 700 15000
+haptic look
+snap look
+# ...and taking the pulse cleared it
+haptic none
+# The three press phases one at a time rather than through `click`, which is
+# what proves press, drag and release are separate entry points and not a lump.
+mouse left press 2 3
+mouse left drag 9 3
+mouse left release 9 3
+stable 700 10000
+snap dragged
+# ponytail: `y` here would yank that selection into the core's register and
+# fire set_clipboard, which is what the harness's `clipboard <text>` asserts.
+# It is not scripted because the expected text has to be READ off this golden
+# first — a guessed span would hand the next person a failing script instead of
+# a capture. Add the two lines once `snap dragged` shows what got selected.
+# A button-less hover: the core tracks it for the link and definition underline.
+mouse none motion 4 5
+stable 400 5000
+snap hover
+# A trackpad's precise scroll is fractional rows the core accumulates into whole
+# wheel presses; a real mouse notch skips the smoothing and arrives as an
+# ordinary button. Both spellings, so the two paths stay distinguishable.
+scroll -3 4 5
+stable 700 10000
+snap scrolled
+wheel wheeldown 4 5
+stable 700 10000
+snap notched
+# THREE FINGERS = button 2 = Exec. `New` in the top tag is a builtin, so this
+# spawns a pane rather than running something the machine would have to own.
+fingers 3 1 0
+stable 700 20000
+haptic exec
+snap exec
+# A DEEP PRESS is the same button 2 by another route; `Newcol` proves it went
+# somewhere different from the click above.
+force 5 0
+stable 700 20000
+haptic exec
+snap force
+# One finger is still an ordinary left press, and selecting is not a verb the
+# hand should feel.
+fingers 1 4 3
+stable 700 10000
+haptic none
+snap select
+draw trackpad