Fix conflict test race condition with use-kbd hotkey handler

After use-kbd changes that enable hotkeys while modal is open (disabled
only when editing), the test needs to wait for editing mode before
pressing the conflicting key. Without this wait, the key press can
trigger the existing action before React state propagates.

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

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

Author: ryan-williams

www/test/e2e/hotkey-editing.spec.ts

@@ -329,6 +329,10 @@ test.describe('Hotkey Editing', () => {
 
     // Now assign 'x' to Temperature
     await leftKbd.click()
+
+    // Wait for editing mode before pressing key (prevents race with hotkey handler)
+    await expect(leftKbd).toHaveClass(/editing/)
+
     await page.keyboard.press('x')
 
     // Wait for sequence timeout (1000ms) + buffer for conflict detection