A selection holds up to 1024 ranges on the desktop, 64 on the board

The limit was 64 everywhere, which helix-golf's enumerate_and_align outgrows
(%s |\d+ makes 121 ranges). It is now memory.limits.selections, per platform,
and the counts that hold it are u16. The ranges stay inline in each Text, so a
pane grows by about 80 KiB on the desktop (three texts and the regex prompt's
snapshot); the Pane size budget in Terminal.zig moves from 128 to 160 KiB and
says why.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 1b82d2a8..455a325e 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -752,7 +752,7 @@ test "the acme chords act once per selection, not once on the primary" {
         .{ .anchor = 7, .head = 13 },
     };
     pane.body.setRanges(pane.file.?.content, &ranges, &.{}, 0, true);
-    try std.testing.expectEqual(@as(u8, 1), pane.body.nsel);
+    try std.testing.expectEqual(@as(u16, 1), pane.body.nsel);
 
     const before = p.ncol;
     p.update(.{ .key = .{ .cp = Key.tab } }); // config.exec_key: Exec
@@ -760,7 +760,7 @@ test "the acme chords act once per selection, not once on the primary" {
     // other cursor, so one keystroke over two cursors made one column.
     try std.testing.expectEqual(before + 2, p.ncol);
     // ...and the chord consumed the selection exactly as it does with one.
-    try std.testing.expectEqual(@as(u8, 0), p.panes[0].?.body.nsel);
+    try std.testing.expectEqual(@as(u16, 0), p.panes[0].?.body.nsel);
 }
 
 test "a switch clicked with a selection held flips unless the selection says on or off" {