fix: rename LessonPlanKeys to LessonPlanKey

[stefl]

Description

• LessonPlanKeys plural should be LessonPlanKey singular, based on the principle of least surpriste
• Renames this globally
• Type-only update, no UX changes

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
oak-ai-lesson-assistant	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 7, 2025 3:09pm

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Playwright test results

 17 passed
 1 flaky
 2 skipped

Details

 Open report ↗︎
 20 tests across 17 suites
 2 minutes, 56 seconds
 df695d7

Flaky tests

No persona › tests/modifiy-lesson.test.ts › Modify a lesson plan › Modify a lesson resource

Skipped tests

No persona › tests/auth.test.ts › authenticate through Clerk UI
No persona › tests/chat-performance.test.ts › Component renders during lesson chat › There are no unnecessary rerenders across left and right side of chat

[oak-machine-user]

🎉 This PR is included in version 1.20.0 🎉

The release is available on GitHub release

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