Esc alternates between the last two panes; Toggleterm is gone

Esc ran Toggleterm, which hopped between the newest DOC and the newest
TERMINAL. That distinction never earned its keep. It made Esc unpredictable —
which of three panes you landed on depended on their kinds, not on where you
had been — and it could not alternate between two files at all, which is the
case you hit most. Editing two files, Esc did nothing.

The replacement already existed. Last (SPC j j) is "the pane you were in
before this one, whichever it was": it walks the jump stack for the newest
entry naming a different pane and restores its line and column. So Esc, and
Shift-Esc in tty, now run Last, and Toggleterm is deleted rather than renamed
— a third implementation of "go to the other pane" was the thing to avoid.
SPC w t goes with it; the w group is the four directional moves, and the jump
group already had SPC j j.

Held down, Esc alternates. Two files, a file and its shell, a file and a
+Search — all the same, because Last has no notion of kind to get wrong.

This depends on the swap in the same series: Last reads the stack backwards,
and until hopping stopped appending, the pane you came from could fall off it.

windownav.snap needed only its keys and prose changed — its golden did not
move at all, which is the useful evidence here: for the one scenario the old
builtin handled well, Last produces an identical focus sequence.

Coverage for what it did not handle is new: a unit test opens a second FILE by
looking its name and asserts Esc alternates between two panes of the SAME
kind, which is the case that used to be a no-op.

Docs follow: tutor.txt, docs/helix-keys.md, docs/design.typ, and the builtin
index goldens, which are now one row shorter.

75/75 snapshots, both unit suites, and the macOS ABI build all pass.

1 files changed, 55 insertions, 55 deletions

diff --git a/test/snapshots/find.golden b/test/snapshots/find.golden
index 6419cba0..0a33df22 100644
--- a/test/snapshots/find.golden
+++ b/test/snapshots/find.golden
@@ -1,6 +1,6 @@
 == snap group grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del                                                                  SPC f
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
@@ -38,10 +38,10 @@
 |
 |
 |
-|
+|                                                                                                                   SPC f
 == snap armed grid=120x40 cursor=9,39
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
@@ -82,7 +82,7 @@
 |   Find /
 == snap typing grid=120x40 cursor=12,39
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
@@ -123,7 +123,7 @@
 |   Find /zqm
 == snap results grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
@@ -158,13 +158,13 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap first grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
@@ -182,7 +182,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -199,13 +199,13 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == style first
 |0: 0-56 #949494,#121212, 57-119 d,#121212,
-|1: 0-1 #ffffff,#626262, 2-48 #949494,#121212, 49-119 d,#121212,
+|1: 0-1 #ffffff,#626262, 2-99 #949494,#121212, 100-119 d,#121212,
 |2: 0-0 d,#444444, 1-1 d,#080808, 2-6 #949494,#121212, 7-10 #bdbdbd,#080808, 11-119 d,#080808,
 |3: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
 |4: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
@@ -223,7 +223,7 @@
 |16: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
 |17: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
 |18: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
-|19: 0-1 #ffffff,#262626, 2-59 #949494,#121212, 60-119 d,#121212,
+|19: 0-1 #ffffff,#262626, 2-99 #949494,#121212, 100-119 d,#121212,
 |20: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-15 #bdbdbd,#080808, 16-119 d,#080808,
 |21: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
 |22: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
@@ -240,13 +240,13 @@
 |33: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
 |34: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
 |35: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 d,#080808,
-|36: 0-1 #ffffff,#262626, 2-42 #949494,#121212, 43-119 d,#121212,
+|36: 0-1 #ffffff,#262626, 2-99 #949494,#121212, 100-119 d,#121212,
 |37: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-119 #080808,#80a0ff,
 |38: 0-0 d,#444444, 1-1 d,#080808, 2-6 #626262,#080808, 7-31 #bdbdbd,#080808, 32-119 d,#080808,
 |39: 0-0 d,#121212, 1-1 d,#080808, 2-6 #626262,#080808, 7-22 #bdbdbd,#080808, 23-119 d,#080808,
 == snap second grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
@@ -255,7 +255,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -264,7 +264,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -281,22 +281,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap third grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -305,7 +305,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -322,22 +322,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap back grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -346,7 +346,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -363,22 +363,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap word grid=120x40 cursor=9,5
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
 |   Find /
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -387,7 +387,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -404,22 +404,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap cancel grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -428,7 +428,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -445,22 +445,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap nomatch grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -469,7 +469,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -486,22 +486,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap refit grid=120x40 cursor=7,2
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -510,7 +510,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -527,22 +527,22 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt
 == snap topbar grid=120x40 cursor=12,7
 |New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/find/cwd/here.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/here.txt                                                    Save New Del
 |     1 Find
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1
-|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/zqmark-alpha.txt                                            Save New Del
 |     1 alpha body
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 zqmark-alpha.txt
-|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt                                   Save New Del
 |     1 gamma body
 |
 |
@@ -551,7 +551,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt Save New Del
+|  /tmp/pardes-snap/find/cwd/sub/ZQMARK-beta.txt                                         Save New Del
 |     1 beta body
 |
 |
@@ -568,7 +568,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/find/cwd/+Search New Del
+|  /tmp/pardes-snap/find/cwd/+Search                                                          New Del
 |     1 sub/ZQMARK-beta.txt
 |     2 sub/nest/zqmark-gamma.txt
 |     3 zqmark-alpha.txt