Give the ExitedTerminal unit-test builder the new title field

The record gained an explicit-title slot when tab names started surviving
a restart; the test helper that builds one by hand was not updated, so
every job that compiles the lib tests failed to build.

Author: claude

crates/fresh-editor/src/app/window/mod.rs

@@ -4190,6 +4190,7 @@ mod exited_terminal_tests {
             command: command.map(argv),
             resume: resume.map(argv),
             ephemeral: true,
+            title: None,
         }
     }