[dasarisandeepreddy8658]

What does this PR do?

• Adds a 1-second server-side cooldown for raised-hand changes per participant and session.
• Returns HTTP 429 when a participant tries to change their raised-hand state too quickly.
• Disables the frontend hand button during the cooldown and displays a waiting message.
• Adds backend tests for rapid repeated requests and requests after the cooldown expires.

Related issue

Closes #206

Type of change

• Bug fix
• New feature
• Documentation
• Refactoring
• Performance
• Tests
• Build / CI / deployment

Which services does this touch?

• apps/frontend
• apps/http-server
• apps/ws-server
• apps/streaming
• apps/genAI
• packages/db (schema or Prisma changes)
• Docker / CI

How did you test this?

• Ran pnpm.cmd --filter ./apps/frontend test — 72 tests passed across 9 test files.
• Ran pnpm.cmd --filter ./apps/streaming test — 33 tests passed across 2 test files.
• Added backend tests to verify that rapid repeated hand changes return HTTP 429 and that requests are accepted again after the cooldown expires.

Implementation note: The cooldown is stored in memory and is tracked separately by each streaming server instance.

Checklist

• I ran pnpm run lint
• I ran pnpm run check-types
• I ran pnpm run build
• The app still starts with docker-compose up
• I updated documentation if this changes behaviour or setup
• I did not commit any .env file, API key or other secret

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First pull request here? CONTRIBUTING.md walks through the
whole process, and a checkbox left unticked is not a problem — say so and we
will help.