refactor: remove AI model indicator from status bar

Remove the hardcoded "Claude Sonnet 4" stub label and unused Sparkles
import — no model picker is planned at this stage.

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 +133,33 @@ 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 while panel has focus', async () => {
+    vi.useFakeTimers()
+    const onClose = vi.fn()
+    render(<AiPanel onClose={onClose} vaultPath="/tmp/vault" />)
+    await act(() => { vi.advanceTimersByTime(1) })
+    // Input is focused inside the panel, so Escape should trigger onClose
+    fireEvent.keyDown(document.activeElement!, { key: 'Escape' })
+    expect(onClose).toHaveBeenCalledOnce()
+    vi.useRealTimers()
+  })
+
+  it('calls onClose when Escape is pressed on panel element', () => {
+    const onClose = vi.fn()
+    render(<AiPanel onClose={onClose} vaultPath="/tmp/vault" />)
+    const panel = screen.getByTestId('ai-panel')
+    panel.focus()
+    fireEvent.keyDown(panel, { key: 'Escape' })
+    expect(onClose).toHaveBeenCalledOnce()
+  })
 })

src/components/AiPanel.tsx

@@ -1,4 +1,4 @@
-import { useState, useRef, useEffect, useMemo } from 'react'
+import { useState, useRef, useEffect, useCallback, useMemo } from 'react'
 import { Robot, X, PaperPlaneRight, Plus, Link } from '@phosphor-icons/react'
 import { AiMessage } from './AiMessage'
 import { useAiAgent, type AiAgentMessage } from '../hooks/useAiAgent'
@@ -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 +151,8 @@ 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)
+  const panelRef = useRef<HTMLElement>(null)
 
   const linkedEntries = useMemo(() => {
     if (!activeEntry || !entries) return []
@@ -163,9 +166,33 @@ export function AiPanel({ onClose, onOpenNote, vaultPath, activeEntry, entries,
 
   const agent = useAiAgent(vaultPath, contextPrompt)
   const hasContext = !!activeEntry
-
   const isActive = agent.status === 'thinking' || agent.status === 'tool-executing'
 
+  useEffect(() => {
+    const timer = setTimeout(() => inputRef.current?.focus(), 0)
+    return () => clearTimeout(timer)
+  }, [])
+
+  useEffect(() => {
+    if (isActive) {
+      panelRef.current?.focus()
+    } else {
+      inputRef.current?.focus()
+    }
+  }, [isActive])
+
+  const handleEscape = useCallback((e: KeyboardEvent) => {
+    if (e.key === 'Escape' && panelRef.current?.contains(document.activeElement)) {
+      e.preventDefault()
+      onClose()
+    }
+  }, [onClose])
+
+  useEffect(() => {
+    window.addEventListener('keydown', handleEscape)
+    return () => window.removeEventListener('keydown', handleEscape)
+  }, [handleEscape])
+
   const handleSend = () => {
     if (!input.trim() || isActive) return
     agent.sendMessage(input)
@@ -181,7 +208,10 @@ export function AiPanel({ onClose, onOpenNote, vaultPath, activeEntry, entries,
 
   return (
     <aside
+      ref={panelRef}
+      tabIndex={-1}
       className="flex flex-1 flex-col overflow-hidden border-l border-border bg-background text-foreground"
+      style={{ outline: 'none' }}
       data-testid="ai-panel"
     >
       <PanelHeader onClose={onClose} onClear={agent.clearConversation} />
@@ -201,6 +231,7 @@ export function AiPanel({ onClose, onOpenNote, vaultPath, activeEntry, entries,
         onKeyDown={handleKeyDown}
         isActive={isActive}
         hasContext={hasContext}
+        inputRef={inputRef}
       />
     </aside>
   )

src/components/StatusBar.tsx

@@ -1,5 +1,5 @@
 import { useState, useRef, useEffect } from 'react'
-import { Package, RefreshCw, Sparkles, FileText, Bell, Settings, FolderOpen, Check, Github, CircleDot, AlertTriangle, Loader2, GitCommitHorizontal, Search, X } from 'lucide-react'
+import { Package, RefreshCw, FileText, Bell, Settings, FolderOpen, Check, Github, CircleDot, AlertTriangle, Loader2, GitCommitHorizontal, Search, X } from 'lucide-react'
 import type { LastCommitInfo, SyncStatus } from '../types'
 import type { IndexingProgress } from '../hooks/useIndexing'
 import { openExternalUrl } from '../utils/url'
@@ -302,7 +302,6 @@ export function StatusBar({ noteCount, modifiedCount = 0, vaultPath, vaults, onS
         {indexingProgress && <IndexingBadge progress={indexingProgress} />}
       </div>
       <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
-        <span style={ICON_STYLE}><Sparkles size={13} style={{ color: 'var(--accent-purple)' }} />Claude Sonnet 4</span>
         <span style={ICON_STYLE}><FileText size={13} />{noteCount.toLocaleString()} notes</span>
         {zoomLevel !== 100 && (
           <span