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]>

1 files changed, 2 insertions, 3 deletions

diff --git a/src/gui/gui.zig b/src/gui/gui.zig
index 97bbc816..dfd528a3 100644
--- a/src/gui/gui.zig
+++ b/src/gui/gui.zig
@@ -7360,7 +7360,7 @@ fn appendWorkspacePet(g: *Gui, core: ?*const pardes.Pardes, surface: *const pard
     for (surface.cells[0..surface.cols], 0..) |*cell, i| {
         if (cellCodepoint(cell) != ' ') occupied = i + 1;
     }
-    const editing = p.topbar_col != null and p.header_column == null;
+    const editing = p.header_focus and p.header_column == null;
     const band_top: f32 = @floatFromInt(taglineBandOffset(0, builder.win_h, g.cell_h, g.tagline_height));
     const region = if (occupied >= surface.cols) null else pet.lane(
         occupied,
@@ -7412,8 +7412,7 @@ test "pet overlay stays beyond workspace text and vanishes while its tag is edit
         try std.testing.expect(x >= 20 * 8 - 0.01);
         try std.testing.expect(y >= 0 and y < 20);
     }
-    core.topbar_col = 0;
-    core.header_column = null;
+    core.enterHeader(null);
     builder.len = 0;
     appendWorkspacePet(&g, core, &surface, &builder);
     try std.testing.expectEqual(@as(usize, 0), builder.len);