fix: Resolve smoke test race condition in FIFO cleanup

The test was deleting the temp directory immediately after unmount,
but the EventReader had pending reconnection timers that would fire
and try to access the deleted FIFO.

Fix:
- Move cleanup to afterEach hook
- Add sleep delays to allow timers to clear
- Wrap cleanup in try/catch to ignore errors

All 133 tests now pass with 0 errors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tui/src/app-smoke.test.tsx

@@ -2,7 +2,7 @@ import { execSync } from 'node:child_process';
 import { createWriteStream, mkdtempSync, rmSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, afterEach } from 'vitest';
 import { render } from 'ink-testing-library';
 import { App } from './app.js';
 
@@ -28,11 +28,29 @@ async function waitForFrameContains(getFrame: () => string | undefined, text: st
   throw new Error(`Timed out waiting for frame to contain: ${text}`);
 }
 
+function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
 describe('HUD smoke test', () => {
   const testFn = canUseFifo() ? it : it.skip;
+  let tempDir: string | null = null;
+
+  afterEach(async () => {
+    // Wait for any pending timers to clear before cleanup
+    await sleep(100);
+    if (tempDir) {
+      try {
+        rmSync(tempDir, { recursive: true, force: true });
+      } catch {
+        // Ignore cleanup errors
+      }
+      tempDir = null;
+    }
+  });
 
   testFn('renders and processes fifo events', async () => {
-    const tempDir = mkdtempSync(join(tmpdir(), 'claude-hud-'));
+    tempDir = mkdtempSync(join(tmpdir(), 'claude-hud-'));
     const fifoPath = join(tempDir, 'events.fifo');
     execSync(`${MKFIFO_COMMAND} ${fifoPath}`);
 
@@ -52,6 +70,7 @@ describe('HUD smoke test', () => {
     await waitForFrameContains(lastFrame, 'Claude HUD');
 
     unmount();
-    rmSync(tempDir, { recursive: true, force: true });
+    // Wait for EventReader cleanup timers to clear
+    await sleep(50);
   });
 });