⚡ Bolt: [performance improvement] Optimize handleAgentEvents complexity

[iotserver24]

💡 What: Extracts target index searching (lastAssistantIndex, pendingToolIndices) outside the batch loop inside handleAgentEvents.
🎯 Why: Previously, finding the target message inside the batch loop created an O(N*M) complexity (where N is the chat history length and M is the batch size). For large conversations or streaming bodies, this blocked the React main thread, causing severe UI lag.
📊 Impact: Reduces time complexity to O(N+M), practically removing scaling slowdowns during heavy token streaming. Also fixes a subtle bug where simultaneous tool_call and tool_result events were mishandled by using an array queue instead of a singular tracked index.
🔬 Measurement: Verified with pnpm test and pnpm lint. Playwright screenshot confirms the app UI renders messages flawlessly with the updated state logic.

---

PR created automatically by Jules for task 172685728171467853 started by @iotserver24

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: bb16cbb1-5907-494a-96f0-5c2eaa74b12b

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-optimize-handle-agent-events-172685728171467853

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[xibe-review]

Hey @iotserver24! 👋

I'll go through the changes and help you out with an automated review! 🔍

Starting the review now...