Make the column and workspace tags Texts with the pane tag's keys

The headers had their own one-line editor with its own keys: Enter always
executed, h/l and J/K moved between headers and panes, Ctrl-c/x/v cut and
pasted, and TagLine refused a newline that 9P accepted. They are now Texts
like a pane's tag, with no prefix and a default until edited, so normal and
insert mode, undo and the look and execute keys are the body's. Moving
between them is the window keys' job: Up from a pane with nothing above it
reaches its column's tag and then the workspace's, Down comes back, and
Left and Right walk the column tags.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

2 files changed, 67 insertions, 0 deletions

diff --git a/test/snapshots/tagnav.golden b/test/snapshots/tagnav.golden
index 3fdba9f2..45d64b42 100644
--- a/test/snapshots/tagnav.golden
+++ b/test/snapshots/tagnav.golden
@@ -39,3 +39,27 @@
 |5:      3 gamma                                        $
 == snap tty-tag grid=100x31 cursor=90,2
 == snap tty-restored grid=100x31 cursor=54,5
+== snap column-tag grid=100x31 cursor=3,1
+|2:    /tmp/pardes-snap/tagnav/cwd/w.txt Save Tty Coll   /tmp/pardes-snap/tagnav/cwd Tty Save Mode Filte
+|3:      1 alpha                                   Up   ls
+|5:      3 gamma
+== snap column-word grid=100x31 cursor=6,1
+|3:      1 alpha                                        ls
+== snap workspace-tag grid=100x31 cursor=0,0
+|3:      1 alpha                                   Up   ls
+== snap topbar-dollar grid=100x31 cursor=70,0
+|3:      1 alpha                                        ls
+== snap topbar-dump-word grid=100x31 cursor=46,0
+== snap topbar-exec grid=100x31 cursor=7,3
+|0: Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill Restore /tmp/pardes-snap/tag
+|3:      1 alpha                                 Dump   ls
+== snap topbar-restore-word grid=100x31 cursor=72,0
+|3:      1 alpha                                        ls
+== snap topbar-restored grid=100x31 cursor=7,3
+|0: Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|3:      1 alpha                                        $ ls
+|5:      3 gamma                                        $
+|6:                                                     ── restored history ──
+|18:   $ ls
+|20:   $
+|21:   ── restored history ──
diff --git a/test/snapshots/tagnav.snap b/test/snapshots/tagnav.snap
index eed808de..c9ac9605 100644
--- a/test/snapshots/tagnav.snap
+++ b/test/snapshots/tagnav.snap
@@ -77,3 +77,46 @@ settle 100
 key :
 stable 400 5000
 snap tty-restored
+# The column and workspace tags are Texts in the same layout, with the same
+# keys: Up from a pane with nothing above it reaches its column's tag, in
+# normal mode, then the workspace's; Down comes back the same way.
+key c-b
+stable 700 15000
+key c-w h
+stable 400 5000
+key c-w k
+stable 400 5000
+snap column-tag
+key w
+stable 400 5000
+snap column-word
+key c-w k
+stable 400 5000
+snap workspace-tag
+# `$` is the last cell; four long-word steps back land on `Dump`, and the
+# execute key runs it and gives the keyboard back to the body FIRST -- `Kill`
+# lives up here too, so a builtin that frees the session must never return
+# into a focused header. Dump grows a `Restore <path>` word, which is also the
+# case where the line gets longer than the column you were parked on.
+key $
+stable 400 5000
+snap topbar-dollar
+key B B B B
+stable 400 5000
+snap topbar-dump-word
+key tab
+stable 700 15000
+snap topbar-exec
+# THE DELETION HAZARD, from the bar itself: `Restore` frees every pane and
+# swaps the core out from under the caller. Walk back up onto the word the
+# Dump just grew -- B twice off the tail, because the LONG word motions are the
+# ones that step over a path in one go -- and run it.
+key c-w k
+key c-w k
+stable 400 5000
+key $ B B
+stable 400 5000
+snap topbar-restore-word
+key tab
+stable 900 15000
+snap topbar-restored