fix: auto-focus AI Chat input on panel open and close on Escape

When AI Chat panel mounts (via Cmd+I), the input field now receives
focus automatically so users can type immediately without clicking.
Pressing Escape in the input closes the panel.

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

src/components/AiPanel.test.tsx

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi } from 'vitest'
-import { render, screen, fireEvent } from '@testing-library/react'
+import { render, screen, fireEvent, act } from '@testing-library/react'
 import { AiPanel } from './AiPanel'
 import type { VaultEntry } from '../types'
 
@@ -133,4 +133,21 @@ describe('AiPanel', () => {
     const input = screen.getByTestId('agent-input') as HTMLInputElement
     expect(input.placeholder).toBe('Ask the AI agent...')
   })
+
+  it('auto-focuses input on mount', async () => {
+    vi.useFakeTimers()
+    render(<AiPanel onClose={vi.fn()} vaultPath="/tmp/vault" />)
+    await act(() => { vi.advanceTimersByTime(1) })
+    const input = screen.getByTestId('agent-input')
+    expect(document.activeElement).toBe(input)
+    vi.useRealTimers()
+  })
+
+  it('calls onClose when Escape is pressed in input', () => {
+    const onClose = vi.fn()
+    render(<AiPanel onClose={onClose} vaultPath="/tmp/vault" />)
+    const input = screen.getByTestId('agent-input')
+    fireEvent.keyDown(input, { key: 'Escape' })
+    expect(onClose).toHaveBeenCalledOnce()
+  })
 })

src/components/AiPanel.tsx

@@ -103,10 +103,10 @@ function MessageHistory({ messages, isActive, onOpenNote, hasContext }: {
   )
 }
 
-function InputBar({ input, onInputChange, onSend, onKeyDown, isActive, hasContext }: {
+function InputBar({ input, onInputChange, onSend, onKeyDown, isActive, hasContext, inputRef }: {
   input: string; onInputChange: (v: string) => void
   onSend: () => void; onKeyDown: (e: React.KeyboardEvent) => void
-  isActive: boolean; hasContext: boolean
+  isActive: boolean; hasContext: boolean; inputRef: React.RefObject<HTMLInputElement | null>
 }) {
   const sendDisabled = isActive || !input.trim()
   return (
@@ -116,6 +116,7 @@ function InputBar({ input, onInputChange, onSend, onKeyDown, isActive, hasContex
     >
       <div className="flex items-end gap-2">
         <input
+          ref={inputRef}
           value={input}
           onChange={e => onInputChange(e.target.value)}
           onKeyDown={onKeyDown}
@@ -150,6 +151,13 @@ function InputBar({ input, onInputChange, onSend, onKeyDown, isActive, hasContex
 
 export function AiPanel({ onClose, onOpenNote, vaultPath, activeEntry, entries, allContent }: AiPanelProps) {
   const [input, setInput] = useState('')
+  const inputRef = useRef<HTMLInputElement>(null)
+
+  useEffect(() => {
+    // Small delay to ensure DOM is ready after panel mount
+    const timer = setTimeout(() => inputRef.current?.focus(), 0)
+    return () => clearTimeout(timer)
+  }, [])
 
   const linkedEntries = useMemo(() => {
     if (!activeEntry || !entries) return []
@@ -173,6 +181,11 @@ export function AiPanel({ onClose, onOpenNote, vaultPath, activeEntry, entries,
   }
 
   const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Escape') {
+      e.preventDefault()
+      onClose()
+      return
+    }
     if (e.key === 'Enter' && !e.shiftKey) {
       e.preventDefault()
       handleSend()
@@ -201,6 +214,7 @@ export function AiPanel({ onClose, onOpenNote, vaultPath, activeEntry, entries,
         onKeyDown={handleKeyDown}
         isActive={isActive}
         hasContext={hasContext}
+        inputRef={inputRef}
       />
     </aside>
   )