test: add Playwright smoke test for wikilink rendering in AI chat

Update mock agent response to include [[wikilinks]] for testing.
Add smoke test verifying wikilinks render as clickable elements
with correct text, attributes, and styling.

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

src/utils/ai-agent.test.ts

@@ -50,7 +50,7 @@ describe('streamClaudeAgent', () => {
     // Wait for the setTimeout mock response
     await new Promise(r => setTimeout(r, 400))
 
-    expect(onText).toHaveBeenCalledWith(expect.stringContaining('Claude CLI'))
+    expect(onText).toHaveBeenCalledWith(expect.stringContaining('Build Laputa App'))
     expect(onDone).toHaveBeenCalled()
     expect(onError).not.toHaveBeenCalled()
     expect(onToolStart).not.toHaveBeenCalled()

src/utils/ai-agent.ts

@@ -58,7 +58,7 @@ export async function streamClaudeAgent(
 ): Promise<void> {
   if (!isTauri()) {
     setTimeout(() => {
-      callbacks.onText('AI Agent requires the Claude CLI. Install it and run the native app.')
+      callbacks.onText('This note is related to [[Build Laputa App]] and [[Matteo Cellini]]. The AI Agent requires the Claude CLI for full functionality.')
       callbacks.onDone()
     }, 300)
     return