fix(tui): drop the redundant plan-step kind label from to-do rows

Every row in the to-do strip is a plan step, so suffixing each row with
"plan step" said nothing while eating horizontal budget on narrow
terminals (user report, 2026-07-23 session). Ready steps now carry no
detail text at all, and non-ready steps show just their state
(running, completed, blocked, ...). Non-step work-graph nodes keep the
state · kind detail pair, and the inspector's "Current" section still
names the node kind, where mixed node kinds actually appear.

Verified: cargo test -p codewhale-tui --bin codewhale-tui 'tui::' —
2698 passed, 0 failed (work_surface 56/56).

crates/tui/src/tui/work_surface/model.rs

@@ -1320,8 +1320,16 @@ fn graph_node_row(snapshot: &WorkGraphSnapshot, node: &WorkNode) -> WorkRow {
     };
     let state = state_label(node);
     let kind = kind_label(node.kind);
-    let detail = if node.state == NodeState::Ready && node.kind == NodeKind::PlanStep {
-        kind.to_string()
+    // To-do rows are self-evidently plan steps — the strip's checkbox marks
+    // already say so, so the "plan step" kind label is pure noise there. A
+    // ready step shows no detail at all; other states show just the state.
+    // Non-step nodes keep the state · kind pair.
+    let detail = if node.kind == NodeKind::PlanStep {
+        if node.state == NodeState::Ready {
+            String::new()
+        } else {
+            state.to_string()
+        }
     } else {
         format!("{state} · {kind}")
     };