fix: hide AssistantFAB during spec creation mode

The Chat AI Assistant button (AssistantFAB) was appearing on top of the
full-screen spec creation chat overlay, causing a visual bug where the
button would overlap with the Send input area.

Changes:
- Add onStepChange callback prop to NewProjectModal to notify parent
  when the modal step changes
- Add onSpecCreatingChange callback prop to ProjectSelector to propagate
  spec creation state up to App.tsx
- Add isSpecCreating state to App.tsx to track when spec creation chat
  is active
- Update AssistantFAB render condition to include !isSpecCreating
- Disable 'A' keyboard shortcut during spec creation mode

The fix propagates the spec creation state through the component
hierarchy: NewProjectModal -> ProjectSelector -> App.tsx, allowing
the FAB to be hidden when step === 'chat' in the new project modal.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/src/App.tsx

@@ -39,6 +39,7 @@ function App() {
   const [debugPanelHeight, setDebugPanelHeight] = useState(288) // Default height
   const [assistantOpen, setAssistantOpen] = useState(false)
   const [showSettings, setShowSettings] = useState(false)
+  const [isSpecCreating, setIsSpecCreating] = useState(false)
 
   const queryClient = useQueryClient()
   const { data: projects, isLoading: projectsLoading } = useProjects()
@@ -100,8 +101,8 @@ function App() {
         setShowExpandProject(true)
       }
 
-      // A : Toggle assistant panel (when project selected)
-      if ((e.key === 'a' || e.key === 'A') && selectedProject) {
+      // A : Toggle assistant panel (when project selected and not in spec creation)
+      if ((e.key === 'a' || e.key === 'A') && selectedProject && !isSpecCreating) {
         e.preventDefault()
         setAssistantOpen(prev => !prev)
       }
@@ -132,7 +133,7 @@ function App() {
 
     window.addEventListener('keydown', handleKeyDown)
     return () => window.removeEventListener('keydown', handleKeyDown)
-  }, [selectedProject, showAddFeature, showExpandProject, selectedFeature, debugOpen, assistantOpen, features, showSettings])
+  }, [selectedProject, showAddFeature, showExpandProject, selectedFeature, debugOpen, assistantOpen, features, showSettings, isSpecCreating])
 
   // Combine WebSocket progress with feature data
   const progress = wsState.progress.total > 0 ? wsState.progress : {
@@ -167,6 +168,7 @@ function App() {
                 selectedProject={selectedProject}
                 onSelectProject={handleSelectProject}
                 isLoading={projectsLoading}
+                onSpecCreatingChange={setIsSpecCreating}
               />
 
               {selectedProject && (
@@ -290,8 +292,8 @@ function App() {
         />
       )}
 
-      {/* Assistant FAB and Panel - hide FAB when expand modal is open */}
-      {selectedProject && !showExpandProject && (
+      {/* Assistant FAB and Panel - hide when expand modal or spec creation is open */}
+      {selectedProject && !showExpandProject && !isSpecCreating && (
         <>
           <AssistantFAB
             onClick={() => setAssistantOpen(!assistantOpen)}

ui/src/components/NewProjectModal.tsx

@@ -25,12 +25,14 @@ interface NewProjectModalProps {
   isOpen: boolean
   onClose: () => void
   onProjectCreated: (projectName: string) => void
+  onStepChange?: (step: Step) => void
 }
 
 export function NewProjectModal({
   isOpen,
   onClose,
   onProjectCreated,
+  onStepChange,
 }: NewProjectModalProps) {
   const [step, setStep] = useState<Step>('name')
   const [projectName, setProjectName] = useState('')
@@ -46,6 +48,12 @@ export function NewProjectModal({
 
   const createProject = useCreateProject()
 
+  // Wrapper to notify parent of step changes
+  const changeStep = (newStep: Step) => {
+    setStep(newStep)
+    onStepChange?.(newStep)
+  }
+
   if (!isOpen) return null
 
   const handleNameSubmit = (e: React.FormEvent) => {
@@ -63,18 +71,18 @@ export function NewProjectModal({
     }
 
     setError(null)
-    setStep('folder')
+    changeStep('folder')
   }
 
   const handleFolderSelect = (path: string) => {
     // Append project name to the selected path
     const fullPath = path.endsWith('/') ? `${path}${projectName.trim()}` : `${path}/${projectName.trim()}`
     setProjectPath(fullPath)
-    setStep('method')
+    changeStep('method')
   }
 
   const handleFolderCancel = () => {
-    setStep('name')
+    changeStep('name')
   }
 
   const handleMethodSelect = async (method: SpecMethod) => {
@@ -82,7 +90,7 @@ export function NewProjectModal({
 
     if (!projectPath) {
       setError('Please select a project folder first')
-      setStep('folder')
+      changeStep('folder')
       return
     }
 
@@ -94,7 +102,7 @@ export function NewProjectModal({
           path: projectPath,
           specMethod: 'manual',
         })
-        setStep('complete')
+        changeStep('complete')
         setTimeout(() => {
           onProjectCreated(project.name)
           handleClose()
@@ -110,7 +118,7 @@ export function NewProjectModal({
           path: projectPath,
           specMethod: 'claude',
         })
-        setStep('chat')
+        changeStep('chat')
       } catch (err: unknown) {
         setError(err instanceof Error ? err.message : 'Failed to create project')
       }
@@ -125,7 +133,7 @@ export function NewProjectModal({
     try {
       await startAgent(projectName.trim(), yoloMode)
       // Success - navigate to project
-      setStep('complete')
+      changeStep('complete')
       setTimeout(() => {
         onProjectCreated(projectName.trim())
         handleClose()
@@ -144,7 +152,7 @@ export function NewProjectModal({
 
   const handleChatCancel = () => {
     // Go back to method selection but keep the project
-    setStep('method')
+    changeStep('method')
     setSpecMethod(null)
   }
 
@@ -155,7 +163,7 @@ export function NewProjectModal({
   }
 
   const handleClose = () => {
-    setStep('name')
+    changeStep('name')
     setProjectName('')
     setProjectPath(null)
     setSpecMethod(null)
@@ -168,10 +176,10 @@ export function NewProjectModal({
 
   const handleBack = () => {
     if (step === 'method') {
-      setStep('folder')
+      changeStep('folder')
       setSpecMethod(null)
     } else if (step === 'folder') {
-      setStep('name')
+      changeStep('name')
       setProjectPath(null)
     }
   }

ui/src/components/ProjectSelector.tsx

@@ -10,6 +10,7 @@ interface ProjectSelectorProps {
   selectedProject: string | null
   onSelectProject: (name: string | null) => void
   isLoading: boolean
+  onSpecCreatingChange?: (isCreating: boolean) => void
 }
 
 export function ProjectSelector({
@@ -17,6 +18,7 @@ export function ProjectSelector({
   selectedProject,
   onSelectProject,
   isLoading,
+  onSpecCreatingChange,
 }: ProjectSelectorProps) {
   const [isOpen, setIsOpen] = useState(false)
   const [showNewProjectModal, setShowNewProjectModal] = useState(false)
@@ -166,6 +168,7 @@ export function ProjectSelector({
         isOpen={showNewProjectModal}
         onClose={() => setShowNewProjectModal(false)}
         onProjectCreated={handleProjectCreated}
+        onStepChange={(step) => onSpecCreatingChange?.(step === 'chat')}
       />
 
       {/* Delete Confirmation Dialog */}