Fix AI CLI interrupt handling and immediate turn recovery

[youknowriad]

Summary

• Make ESC interrupt handling immediate in the AI CLI UI so the user gets an instant interruption notice instead of waiting for SDK cleanup
• Centralize interrupt cleanup in AiChatUI and suppress duplicate interruption rendering from late SDK messages
• Let the next prompt start a fresh turn directly after an interrupt instead of queuing behind the interrupted turn
• Cover the interrupt lifecycle and immediate next-prompt behavior with focused regression tests

Testing

• npx eslint --fix on the touched CLI UI, command, and test files
• npm test -- apps/cli/ai/tests/ui.test.ts apps/cli/commands/ai/tests/ai.test.ts
• npm run typecheck

[wpmobilebot]

📊 Performance Test Results

Comparing dbf0d01 vs trunk

app-size

Metric	trunk	dbf0d01	Diff	Change
App Size (Mac)	1453.95 MB	1453.92 MB	0.03 MB	⚪ 0.0%

site-editor

Metric	trunk	dbf0d01	Diff	Change
load	1782 ms	1505 ms	277 ms	🟢 -15.5%

site-startup

Metric	trunk	dbf0d01	Diff	Change
siteCreation	8081 ms	8084 ms	+3 ms	⚪ 0.0%
siteStartup	4951 ms	4953 ms	+2 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)