fix: preserve cockpit steps across view toggles and show full step info

Backend: stop wiping pending_task_lane when AI response has no new
[ACTIONS]/[QUESTIONS] markers — previous task lane state is still
relevant until replaced by new markers.

Frontend (selectChat): don't eagerly clear task lane before server
response arrives; restore from sessionStorage as fallback when
pending_task_lane is null (covers sessions before backend fix).

StepsPanel: show description and command for all steps instead of
hiding behind hover/active-only visibility. Commands render as
inline code blocks.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/hooks/useAssistantSession.ts

@@ -168,9 +168,7 @@ export function useAssistantSession() {
   const selectChat = useCallback(async (chatId: string) => {
     currentChatRef.current = chatId
     setActiveChatId(chatId)
-    setShowTaskLane(false)
-    setActiveQuestions([])
-    setActiveActions([])
+    // Don't clear task lane yet — wait for server response to decide
     try {
       const detail = await aiSessionsApi.getSession(chatId)
       if (currentChatRef.current !== chatId) return
@@ -188,7 +186,7 @@ export function useAssistantSession() {
         triage_hypothesis: detail.triage_hypothesis ?? null,
         evidence_items: detail.evidence_items ?? null,
       })
-      // Restore task lane from persisted state
+      // Restore task lane from server state
       if (detail.pending_task_lane) {
         const q = detail.pending_task_lane.questions || []
         const a = detail.pending_task_lane.actions || []
@@ -202,10 +200,35 @@ export function useAssistantSession() {
           setActiveQuestions(q)
           setActiveActions(a)
           setShowTaskLane(true)
+          return
         }
       }
+      // Fallback: restore from sessionStorage (covers view toggles before backend fix)
+      try {
+        const saved = sessionStorage.getItem('rf-tasklane-meta')
+        if (saved) {
+          const d = JSON.parse(saved)
+          if (d.chatId === chatId) {
+            const q = d.questions || []
+            const a = d.actions || []
+            if (q.length > 0 || a.length > 0) {
+              setActiveQuestions(q)
+              setActiveActions(a)
+              setShowTaskLane(d.show === true)
+              return
+            }
+          }
+        }
+      } catch { /* ignore */ }
+      // No task lane data from either source — clear
+      setShowTaskLane(false)
+      setActiveQuestions([])
+      setActiveActions([])
     } catch {
       setMessages([])
+      setShowTaskLane(false)
+      setActiveQuestions([])
+      setActiveActions([])
     }
   }, [])