refactor: simplify reference lap logic & store reactivity

[BatMichoo]

Description

Refactored the SectorDelta widget and ReferenceLapStore to simplify reference lap selection and improve store reactivity.

• Automatic Reference Selection: useLiveSectorDelta now automatically picks the best reference lap (Session Best -> Class Best/Ghost).
• Store Refactoring: Simplified ReferenceLapStore by removing redundant state (seriesId, persistedLapsVersion, fileLoadedClassIds).
• Performance & Reactivity: Replaced manual getState calls with proper Zustand selectors.
• Optimization: Prevented unnecessary re-renders in SectorTimingStore.

Type of Change

• New feature
• Bug fix
• Performance improvement
• Refactoring

Checklist

• I have tested this in iRacing
• All tests pass locally via npm test
• I have run npm run lint
• I have performed a self-review
• I have added/updated Storybook stories

[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: 3f4337dd-ea28-4fb6-aca6-aab9fb8b8720

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

Tip

💬 Introducing Slack Agent: The best way for teams to turn conversations into code.

Slack Agent is built on CodeRabbit's deep understanding of your code, so your team can collaborate across the entire SDLC without losing context.

• Generate code and open pull requests
• Plan features and break down work
• Investigate incidents and troubleshoot customer tickets together
• Automate recurring tasks and respond to alerts with triggers
• Summarize progress and report instantly

Built for teams:

• Shared memory across your entire org—no repeating context
• Per-thread sandboxes to safely plan and execute work
• Governance built-in—scoped access, auditability, and budget controls

One agent for your entire SDLC. Right inside Slack.

👉 Get started

---

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.}