fix(tui): keep the clipped part of a tool header at narrow widths; /jobs prints plain exit codes and a three-line tail

truncate_spans_to_width dropped the whole overflowing span, so at 80 columns the running and failed headers lost the command. It now pushes the partial span before the ellipsis. /jobs and the job pager no longer print Rust Debug text (exit=Some(0), Exit Code: None); they show 'exit N' or 'no exit yet', and the tail is the last three lines instead of one blob with literal \n. From the shell-task UX audit (artifacts/shell-ux-audit-20261011/REPORT.md, slices 1 and 2).

Evidence: nextest -E 'test(/transcript|shell_job|jobs|truncate|tool_header|history/)': 638 run, 638 passed. Not run: clippy, PTY tests, hosted CI.

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

crates/tui/src/tui/shell_job_routing.rs

@@ -36,11 +36,11 @@ pub(super) fn format_shell_job_list(jobs: &[ShellJobSnapshot]) -> String {
             .map(|id| format!(" task={id}"))
             .unwrap_or_default();
         lines.push(format!(
-            "{}  {:8}  {}  exit={:?}{}",
+            "{}  {:8}  {}  {}{}",
             job.id,
             status_label(&job.status, job.stale),
             codewhale_command_contract::elapsed::format_elapsed_ms(job.elapsed_ms),
-            job.exit_code,
+            exit_label(job.exit_code),
             task
         ));
         lines.push(format!("  cwd: {}", crate::utils::display_path(&job.cwd)));
@@ -50,8 +50,10 @@ pub(super) fn format_shell_job_list(jobs: &[ShellJobSnapshot]) -> String {
         } else {
             job.stdout_tail.trim()
         };
-        if !tail.is_empty() {
-            lines.push(format!("  tail: {}", tail.replace('\n', "\\n")));
+        let tail_lines: Vec<&str> = tail.lines().collect();
+        let shown = tail_lines.len().saturating_sub(3);
+        for line in &tail_lines[shown..] {
+            lines.push(format!("  | {line}"));
         }
     }
     lines.push(
@@ -61,13 +63,21 @@ pub(super) fn format_shell_job_list(jobs: &[ShellJobSnapshot]) -> String {
     lines.join("\n")
 }
 
+fn exit_label(code: Option<i64>) -> String {
+    match code {
+        Some(0) => "exit 0".to_string(),
+        Some(code) => format!("exit {code}"),
+        None => "no exit yet".to_string(),
+    }
+}
+
 pub(super) fn format_shell_poll(result: &ShellResult) -> String {
     let mut lines = vec![
         format!(
-            "Bash job {}: {} exit={:?} elapsed={}",
+            "Bash job {}: {} {} elapsed={}",
             result.task_id.as_deref().unwrap_or("(unknown)"),
             status_label(&result.status, false),
-            result.exit_code,
+            exit_label(result.exit_code),
             codewhale_command_contract::elapsed::format_elapsed_ms(result.duration_ms)
         ),
         String::new(),
@@ -187,7 +197,7 @@ pub(crate) fn format_shell_job_detail(detail: &ShellJobDetail) -> String {
         "Elapsed: {}",
         codewhale_command_contract::elapsed::format_elapsed_ms(job.elapsed_ms)
     ));
-    lines.push(format!("Exit Code: {:?}", job.exit_code));
+    lines.push(format!("Exit Code: {}", exit_label(job.exit_code)));
     lines.push(format!("Stdin Available: {}", job.stdin_available));
     if let Some(task_id) = job.linked_task_id.as_ref() {
         lines.push(format!("Linked Task: {task_id}"));

crates/tui/src/tui/transcript.rs

@@ -1335,6 +1335,9 @@ fn truncate_spans_to_width(spans: Vec<Span<'static>>, max_width: usize) -> Vec<S
         for ch in span.content.chars() {
             let width = unicode_width::UnicodeWidthChar::width(ch).unwrap_or(0);
             if used + width > content_budget {
+                if !content.is_empty() {
+                    truncated.push(Span::styled(content, span.style));
+                }
                 break 'outer;
             }
             content.push(ch);