feat: wikilink pills in message bubbles, noteList context injection

- Render [[wikilink]] reference pills inside sent message bubbles
  with type-colored badges; clicking a pill opens the note
- Add noteList (filtered note list titles, max 100) and noteListFilter
  to the structured context snapshot sent to the AI
- Thread noteList/noteListFilter from App → Editor → EditorRightPanel → AiPanel
- Store references in AiAgentMessage for display in chat history
- Add tests for reference pill rendering and noteList context

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

src/hooks/useAiAgent.ts

@@ -9,6 +9,7 @@
  */
 import { useState, useCallback, useRef, useEffect } from 'react'
 import type { AiAction } from '../components/AiMessage'
+import type { NoteReference } from '../utils/ai-context'
 import { streamClaudeAgent, buildAgentSystemPrompt } from '../utils/ai-agent'
 import { nextMessageId } from '../utils/ai-chat'
 
@@ -16,6 +17,7 @@ export type AgentStatus = 'idle' | 'thinking' | 'tool-executing' | 'done' | 'err
 
 export interface AiAgentMessage {
   userMessage: string
+  references?: NoteReference[]
   reasoning?: string
   reasoningDone?: boolean
   actions: AiAction[]
@@ -34,12 +36,14 @@ export function useAiAgent(vaultPath: string, contextPrompt?: string) {
     contextRef.current = contextPrompt
   }, [contextPrompt])
 
-  const sendMessage = useCallback(async (text: string) => {
+  const sendMessage = useCallback(async (text: string, references?: NoteReference[]) => {
     if (!text.trim() || status === 'thinking' || status === 'tool-executing') return
 
+    const refs = references && references.length > 0 ? references : undefined
+
     if (!vaultPath) {
       setMessages(prev => [...prev, {
-        userMessage: text.trim(), actions: [],
+        userMessage: text.trim(), references: refs, actions: [],
         response: 'No vault loaded. Open a vault first.',
         id: nextMessageId(),
       }])
@@ -51,7 +55,7 @@ export function useAiAgent(vaultPath: string, contextPrompt?: string) {
 
     const messageId = nextMessageId()
     setMessages(prev => [...prev, {
-      userMessage: text.trim(), actions: [], isStreaming: true, id: messageId,
+      userMessage: text.trim(), references: refs, actions: [], isStreaming: true, id: messageId,
     }])
     setStatus('thinking')