feat: move feature action buttons to pending column header

Move the "Add Feature" (+) and "Expand Project" (sparkles) buttons from
the top navigation bar to the Pending column header in the Kanban board.

Changes:
- KanbanColumn: Add optional onAddFeature, onExpandProject, and
  showExpandButton props; render action buttons in column header
- KanbanBoard: Accept and pass action handlers to the Pending column
- App: Remove buttons from header, pass handlers to KanbanBoard

This improves UX by placing feature creation actions contextually near
the pending features they affect. Keyboard shortcuts (N, E) still work.

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

ui/src/App.tsx

@@ -19,7 +19,7 @@ import { AssistantFAB } from './components/AssistantFAB'
 import { AssistantPanel } from './components/AssistantPanel'
 import { ExpandProjectModal } from './components/ExpandProjectModal'
 import { SettingsModal } from './components/SettingsModal'
-import { Plus, Loader2, Sparkles, Settings } from 'lucide-react'
+import { Loader2, Settings } from 'lucide-react'
 import type { Feature } from './lib/types'
 
 function App() {
@@ -171,31 +171,6 @@ function App() {
 
               {selectedProject && (
                 <>
-                  <button
-                    onClick={() => setShowAddFeature(true)}
-                    className="neo-btn neo-btn-primary text-sm"
-                    title="Add new feature"
-                  >
-                    <Plus size={18} />
-                    <kbd className="ml-1.5 px-1.5 py-0.5 text-xs bg-black/20 rounded font-mono">
-                      N
-                    </kbd>
-                  </button>
-
-                  {/* Expand Project - only show if project has features */}
-                  {features && (features.pending.length + features.in_progress.length + features.done.length) > 0 && (
-                    <button
-                      onClick={() => setShowExpandProject(true)}
-                      className="neo-btn bg-[var(--color-neo-progress)] text-black text-sm"
-                      title="Expand project with AI"
-                    >
-                      <Sparkles size={18} />
-                      <kbd className="ml-1.5 px-1.5 py-0.5 text-xs bg-black/20 rounded font-mono">
-                        E
-                      </kbd>
-                    </button>
-                  )}
-
                   <AgentControl
                     projectName={selectedProject}
                     status={wsState.agentStatus}
@@ -267,6 +242,8 @@ function App() {
             <KanbanBoard
               features={features}
               onFeatureClick={setSelectedFeature}
+              onAddFeature={() => setShowAddFeature(true)}
+              onExpandProject={() => setShowExpandProject(true)}
             />
           </div>
         )}

ui/src/components/KanbanBoard.tsx

@@ -4,9 +4,13 @@ import type { Feature, FeatureListResponse } from '../lib/types'
 interface KanbanBoardProps {
   features: FeatureListResponse | undefined
   onFeatureClick: (feature: Feature) => void
+  onAddFeature?: () => void
+  onExpandProject?: () => void
 }
 
-export function KanbanBoard({ features, onFeatureClick }: KanbanBoardProps) {
+export function KanbanBoard({ features, onFeatureClick, onAddFeature, onExpandProject }: KanbanBoardProps) {
+  const hasFeatures = features && (features.pending.length + features.in_progress.length + features.done.length) > 0
+
   if (!features) {
     return (
       <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
@@ -32,6 +36,9 @@ export function KanbanBoard({ features, onFeatureClick }: KanbanBoardProps) {
         features={features.pending}
         color="pending"
         onFeatureClick={onFeatureClick}
+        onAddFeature={onAddFeature}
+        onExpandProject={onExpandProject}
+        showExpandButton={hasFeatures}
       />
       <KanbanColumn
         title="In Progress"

ui/src/components/KanbanColumn.tsx

@@ -1,4 +1,5 @@
 import { FeatureCard } from './FeatureCard'
+import { Plus, Sparkles } from 'lucide-react'
 import type { Feature } from '../lib/types'
 
 interface KanbanColumnProps {
@@ -7,6 +8,9 @@ interface KanbanColumnProps {
   features: Feature[]
   color: 'pending' | 'progress' | 'done'
   onFeatureClick: (feature: Feature) => void
+  onAddFeature?: () => void
+  onExpandProject?: () => void
+  showExpandButton?: boolean
 }
 
 const colorMap = {
@@ -21,6 +25,9 @@ export function KanbanColumn({
   features,
   color,
   onFeatureClick,
+  onAddFeature,
+  onExpandProject,
+  showExpandButton,
 }: KanbanColumnProps) {
   return (
     <div
@@ -32,10 +39,34 @@ export function KanbanColumn({
         className="px-4 py-3 border-b-3 border-[var(--color-neo-border)]"
         style={{ backgroundColor: colorMap[color] }}
       >
-        <h2 className="font-display text-lg font-bold uppercase flex items-center justify-between text-[var(--color-neo-text)]">
-          {title}
-          <span className="neo-badge bg-white text-[var(--color-neo-text)]">{count}</span>
-        </h2>
+        <div className="flex items-center justify-between">
+          <h2 className="font-display text-lg font-bold uppercase flex items-center gap-2 text-[var(--color-neo-text)]">
+            {title}
+            <span className="neo-badge bg-white text-[var(--color-neo-text)]">{count}</span>
+          </h2>
+          {(onAddFeature || onExpandProject) && (
+            <div className="flex items-center gap-2">
+              {onAddFeature && (
+                <button
+                  onClick={onAddFeature}
+                  className="neo-btn neo-btn-primary text-sm py-1.5 px-2"
+                  title="Add new feature (N)"
+                >
+                  <Plus size={16} />
+                </button>
+              )}
+              {onExpandProject && showExpandButton && (
+                <button
+                  onClick={onExpandProject}
+                  className="neo-btn bg-[var(--color-neo-progress)] text-black text-sm py-1.5 px-2"
+                  title="Expand project with AI (E)"
+                >
+                  <Sparkles size={16} />
+                </button>
+              )}
+            </div>
+          )}
+        </div>
       </div>
 
       {/* Cards */}