feat: UX improvements — copy buttons, shortcuts modal, breadcrumb rewind, create tree CTA

- Add copy-to-clipboard buttons on command blocks (action + custom step nodes)
- Add keyboard shortcuts modal (?) with option loading spinners and [Esc] hint
- Restyle session timer as a pill badge for better visibility
- Add prominent "Create Tree" CTA to MyTreesPage header and empty state
- Make breadcrumb items clickable to rewind navigation to any previous step

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/TreeNavigationPage.tsx

@@ -10,7 +10,8 @@ import { cn, safeGetItem, safeSetItem } from '@/lib/utils'
 import { MarkdownContent } from '@/components/ui/MarkdownContent'
 import { CustomStepModal } from '@/components/step-library/CustomStepModal'
 import { PostStepActionModal, ContinuationModal, ForkTreeModal, ScratchpadSidebar, SessionOutcomeModal } from '@/components/session'
-import { Plus, CheckCircle, ArrowRight, Clock, Terminal } from 'lucide-react'
+import { Plus, CheckCircle, ArrowRight, Clock, Terminal, Clipboard, Check, HelpCircle } from 'lucide-react'
+import { Modal } from '@/components/common/Modal'
 
 interface LocationState {
   sessionId?: string
@@ -41,6 +42,15 @@ export function TreeNavigationPage() {
   const [showOutcomeModal, setShowOutcomeModal] = useState(false)
   const [pendingCompletionDecision, setPendingCompletionDecision] = useState<DecisionRecord | null>(null)
   const [completionSource, setCompletionSource] = useState<CompletionSource>('standard')
+  const [copiedCommand, setCopiedCommand] = useState<string | null>(null)
+  const [shortcutsModalOpen, setShortcutsModalOpen] = useState(false)
+  const [selectingOption, setSelectingOption] = useState<string | null>(null)
+
+  const handleCopyCommand = (text: string) => {
+    navigator.clipboard.writeText(text)
+    setCopiedCommand(text)
+    setTimeout(() => setCopiedCommand(null), 2000)
+  }
 
   // Session metadata (prefill from Repeat Last Session)
   const [ticketNumber, setTicketNumber] = useState<string>(locationState?.prefillTicketNumber || '')
@@ -220,10 +230,12 @@ export function TreeNavigationPage() {
   }
 
   const handleSelectOption = async (_optionId: string, optionLabel: string, nextNodeId: string) => {
-    if (!session || !tree) return
+    if (!session || !tree || selectingOption) return
+
+    setSelectingOption(_optionId)
 
     const node = findNode(currentNodeId, tree.tree_structure)
-    if (!node) return
+    if (!node) { setSelectingOption(null); return }
 
     const exitedAt = new Date().toISOString()
     const enteredAt = currentStepEnteredAt || session.started_at || exitedAt
@@ -259,6 +271,8 @@ export function TreeNavigationPage() {
       })
     } catch (err) {
       console.error('Failed to update session:', err)
+    } finally {
+      setSelectingOption(null)
     }
   }
 
@@ -370,6 +384,16 @@ export function TreeNavigationPage() {
     setCommandOutputOpen(!!prevOutput)
   }
 
+  const handleBreadcrumbJump = (nodeId: string, index: number) => {
+    setPathTaken(prev => prev.slice(0, index + 1))
+    setDecisions(prev => prev.slice(0, index))
+    setCurrentNodeId(nodeId)
+    setCurrentStepEnteredAt(new Date().toISOString())
+    setNotes('')
+    setCommandOutput('')
+    setCommandOutputOpen(false)
+  }
+
   // Compute current node for keyboard shortcuts (must be before any returns for hooks rules)
   const currentNode = tree ? findNode(currentNodeId, tree.tree_structure) : null
   const currentCustomStep = customStepFlow.findCustomStep(currentNodeId)
@@ -379,11 +403,12 @@ export function TreeNavigationPage() {
   useTreeNavigationShortcuts({
     onSelectOption: (index) => {
       const option = currentOptions[index]
-      if (option && session && tree) {
+      if (option && session && tree && !selectingOption) {
         handleSelectOption(option.id, option.label, option.next_node_id)
       }
     },
     onGoBack: handleGoBack,
+    onShowShortcuts: () => setShortcutsModalOpen(true),
     onContinue: () => {
       if (currentNode?.type === 'action' && currentNode.next_node_id) {
         handleContinue()
@@ -392,8 +417,8 @@ export function TreeNavigationPage() {
       }
     },
     optionCount: currentOptions.length,
-    canGoBack: pathTaken.length > 1 && !showMetadataForm && !isLoading,
-    canContinue: !showMetadataForm && !isLoading && (currentNode?.type === 'action' || currentNode?.type === 'solution'),
+    canGoBack: pathTaken.length > 1 && !showMetadataForm && !isLoading && !selectingOption,
+    canContinue: !showMetadataForm && !isLoading && !selectingOption && (currentNode?.type === 'action' || currentNode?.type === 'solution'),
   })
 
   if (isLoading) {
@@ -502,11 +527,19 @@ export function TreeNavigationPage() {
           <div className="flex items-center gap-3">
             <h1 className="text-xl font-bold text-white">{tree.name}</h1>
             {timerDisplay && (
-              <span className="flex items-center gap-1 text-sm text-white/40">
-                <Clock className="h-3.5 w-3.5" />
+              <span className="flex items-center gap-1.5 rounded-full bg-white/10 px-2.5 py-0.5 text-sm text-white/60">
+                <Clock className="h-4 w-4" />
                 {timerDisplay}
               </span>
             )}
+            <button
+              type="button"
+              onClick={() => setShortcutsModalOpen(true)}
+              className="flex items-center justify-center rounded-full p-1 text-white/30 hover:bg-white/10 hover:text-white/60"
+              title="Keyboard shortcuts"
+            >
+              <HelpCircle className="h-4 w-4" />
+            </button>
           </div>
           {(ticketNumber || clientName) && (
             <p className="text-sm text-white/40">
@@ -530,18 +563,23 @@ export function TreeNavigationPage() {
           const node = findNode(nodeId, tree?.tree_structure)
           const customStep = customStepFlow.findCustomStep(nodeId)
           const label = node?.question || node?.title || customStep?.step_data.title || nodeId
+          const truncatedLabel = label.length > 30 ? `${label.slice(0, 30)}...` : label
           return (
             <span key={nodeId} className="flex items-center gap-2 whitespace-nowrap">
               {index > 0 && <span className="text-white/40">→</span>}
-              <span
-                className={cn(
-                  index === pathTaken.length - 1
-                    ? 'font-medium text-white'
-                    : 'text-white/40'
-                )}
-              >
-                {label.length > 30 ? `${label.slice(0, 30)}...` : label}
-              </span>
+              {index < pathTaken.length - 1 ? (
+                <button
+                  type="button"
+                  onClick={() => handleBreadcrumbJump(nodeId, index)}
+                  className="text-white/40 hover:text-white/70 hover:underline"
+                >
+                  {truncatedLabel}
+                </button>
+              ) : (
+                <span className="font-medium text-white">
+                  {truncatedLabel}
+                </span>
+              )}
             </span>
           )
         })}
@@ -565,16 +603,24 @@ export function TreeNavigationPage() {
                 <button
                   key={option.id}
                   onClick={() => handleSelectOption(option.id, option.label, option.next_node_id)}
+                  disabled={!!selectingOption}
                   className={cn(
                     'w-full rounded-md border border-white/10 p-3 text-left text-white transition-colors',
                     'hover:border-white/30 hover:bg-white/[0.06]',
-                    'flex items-center gap-3'
+                    'flex items-center gap-3',
+                    selectingOption && selectingOption !== option.id && 'opacity-50 pointer-events-none'
                   )}
                 >
                   {index < 9 && (
-                    <span className="flex h-6 w-6 shrink-0 items-center justify-center rounded bg-white/10 text-xs font-medium text-white/50">
-                      {index + 1}
-                    </span>
+                    selectingOption === option.id ? (
+                      <span className="flex h-6 w-6 shrink-0 items-center justify-center">
+                        <span className="h-4 w-4 animate-spin rounded-full border-2 border-white/20 border-t-white" />
+                      </span>
+                    ) : (
+                      <span className="flex h-6 w-6 shrink-0 items-center justify-center rounded bg-white/10 text-xs font-medium text-white/50">
+                        {index + 1}
+                      </span>
+                    )
                   )}
                   <span>{option.label}</span>
                 </button>
@@ -650,9 +696,23 @@ export function TreeNavigationPage() {
                   {currentCustomStep.step_data.content.commands.map((cmd, index) => (
                     <div key={index}>
                       <p className="mb-1 text-xs text-white/40">{cmd.label}</p>
-                      <code className="block rounded bg-white/10 p-2 text-sm font-mono">
-                        {cmd.command}
-                      </code>
+                      <div className="group relative">
+                        <code className="block rounded bg-white/10 p-2 pr-8 text-sm font-mono">
+                          {cmd.command}
+                        </code>
+                        <button
+                          type="button"
+                          onClick={() => handleCopyCommand(cmd.command)}
+                          className="absolute right-1.5 top-1.5 opacity-0 transition-opacity group-hover:opacity-100"
+                          title="Copy command"
+                        >
+                          {copiedCommand === cmd.command ? (
+                            <Check className="h-3.5 w-3.5 text-green-400" />
+                          ) : (
+                            <Clipboard className="h-3.5 w-3.5 text-white/40 hover:text-white" />
+                          )}
+                        </button>
+                      </div>
                     </div>
                   ))}
                 </div>
@@ -761,12 +821,23 @@ export function TreeNavigationPage() {
                 <p className="mb-2 text-sm font-medium text-white">Commands:</p>
                 <div className="space-y-1">
                   {currentNode.commands.map((cmd, index) => (
-                    <code
-                      key={index}
-                      className="block rounded bg-white/10 p-2 text-sm font-mono"
-                    >
-                      {cmd}
-                    </code>
+                    <div key={index} className="group relative">
+                      <code className="block rounded bg-white/10 p-2 pr-8 text-sm font-mono">
+                        {cmd}
+                      </code>
+                      <button
+                        type="button"
+                        onClick={() => handleCopyCommand(cmd)}
+                        className="absolute right-1.5 top-1.5 opacity-0 transition-opacity group-hover:opacity-100"
+                        title="Copy command"
+                      >
+                        {copiedCommand === cmd ? (
+                          <Check className="h-3.5 w-3.5 text-green-400" />
+                        ) : (
+                          <Clipboard className="h-3.5 w-3.5 text-white/40 hover:text-white" />
+                        )}
+                      </button>
+                    </div>
                   ))}
                 </div>
                 {/* Command Output Capture */}
@@ -885,7 +956,7 @@ export function TreeNavigationPage() {
             onClick={handleGoBack}
             className="mt-4 text-sm text-white/50 hover:text-white"
           >
-            ← Go back
+            ← Go back <span className="text-xs text-white/30">[Esc]</span>
           </button>
         )}
 
@@ -950,6 +1021,37 @@ export function TreeNavigationPage() {
         onSubmit={handleSubmitOutcome}
         isSubmitting={isCompleting}
       />
+
+      {/* Keyboard Shortcuts Modal */}
+      <Modal
+        isOpen={shortcutsModalOpen}
+        onClose={() => setShortcutsModalOpen(false)}
+        title="Keyboard Shortcuts"
+        size="sm"
+      >
+        <div className="space-y-3 text-sm">
+          <div className="flex items-center justify-between">
+            <span className="text-white/60">Select option</span>
+            <span className="rounded bg-white/10 px-2 py-0.5 font-mono text-xs text-white/80">1-9</span>
+          </div>
+          <div className="flex items-center justify-between">
+            <span className="text-white/60">Go back</span>
+            <span className="rounded bg-white/10 px-2 py-0.5 font-mono text-xs text-white/80">Esc</span>
+          </div>
+          <div className="flex items-center justify-between">
+            <span className="text-white/60">Continue / Complete</span>
+            <span className="rounded bg-white/10 px-2 py-0.5 font-mono text-xs text-white/80">Enter</span>
+          </div>
+          <div className="flex items-center justify-between">
+            <span className="text-white/60">Focus notes</span>
+            <span className="rounded bg-white/10 px-2 py-0.5 font-mono text-xs text-white/80">Tab</span>
+          </div>
+          <div className="flex items-center justify-between">
+            <span className="text-white/60">Show shortcuts</span>
+            <span className="rounded bg-white/10 px-2 py-0.5 font-mono text-xs text-white/80">?</span>
+          </div>
+        </div>
+      </Modal>
       </div>
       </div>