File the tag code into tagline.zig and draw tags beside bodies

With tags reduced to Texts, what is left of them is the computed prefix, the
default and saved tails, entering and leaving a tag and the headers: that goes
to tagline.zig, as acme keeps the tag half of a window in wind.c. Tag and
header drawing moves next to body drawing in body_layer.zig, and the tag hit
helpers go to tag_layer.zig with the Hit they read, where sameCell now also
tells the lines of a taller tag apart. The docs describe the tag as a Text.

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

1 files changed, 4 insertions, 3 deletions

diff --git a/src/normal.zig b/src/normal.zig
index 630f7689..29d6d620 100644
--- a/src/normal.zig
+++ b/src/normal.zig
@@ -2,6 +2,7 @@
 //! modal actions, replayed across every selection, and each action is done
 //! to the pane; PDF panes get their own normal keys.
 const pardes = @import("pardes.zig");
+const tagline = @import("tagline.zig");
 const exec = @import("exec.zig");
 const look = @import("look.zig");
 const std = @import("std");
@@ -556,8 +557,8 @@ fn executeNormalAction(p: *Pardes, t: *Text, semantic: modal.Normal.Action) void
         // keyboard between them.
         .command_line => switch (t.what) {
             .tag => pane.focus = .body,
-            .column, .workspace => p.exitHeader(),
-            .body, .input => p.enterTag(pane),
+            .column, .workspace => tagline.exitHeader(p),
+            .body, .input => tagline.enterTag(p, pane),
         },
         .pipe_selection => |how| return p.startPrompt(pane, .{ .pipe = how }),
         .search => return p.startPrompt(pane, .{ .search = config.search_marker }),
@@ -600,7 +601,7 @@ pub fn handlePdfNormal(p: *Pardes, pane: *Pane, key: Key) void {
                     p.leader_on = true;
                     p.leader_n = 0;
                 },
-                .command_line => p.enterTag(pane),
+                .command_line => tagline.enterTag(p, pane),
                 .search => p.startPrompt(pane, .{ .search = config.search_marker }),
                 .search_forward => look.lookWalk(p, 1),
                 .search_backward => look.lookWalk(p, -1),