T18 review fixes: a missing folder stops the start, combining marks paint on their cell, the terminal is a Tab stop and keeps its wheel, clear drops find matches; the gallery starts a fresh shell per pick and picks the shell tab before typing

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/gallery/pages/terminal/mod.rs

@@ -18,6 +18,9 @@ pub const PAGE: Page = Page {
 
 const SCRIPT: &[Step] = &[
     Step::Rest,
+    Step::DownAt("terminal-tabs", 46.0, 16.0),
+    Step::UpAt("terminal-tabs", 46.0, 16.0),
+    Step::Wait(300),
     Step::DownAt("terminal", 200.0, 150.0),
     Step::UpAt("terminal", 200.0, 150.0),
     Step::Wait(400),