update deps and remove unused deps (#2006)

# Package Dependency Updates

## Description

This PR updates several package dependencies across the project:

- Updated `@elevenlabs/react` from 0.1.5 to 0.5.1 in mail app
- Added `@elevenlabs/elevenlabs-js` 2.12.2 to server app
- Removed unused dependencies: `deepmerge`, `dexie`, `emblor`, and `react-markdown`
- Added `sanitize-html` 2.16.0 to mail app
- Removed `elevenlabs` 1.59.0 from server (replaced with newer `@elevenlabs/elevenlabs-js`)
- Updated PNPM package manager from 10.12.1 to 10.15.0
- Updated Node types from 22.15.29 to 24.3.0
- Updated various dev dependencies including prettier, dotenv-cli, and tsx
- Updated Zod from 3.25.42 to 4.1.1
- Updated wrangler catalog version from 4.28.1 to 4.32.0

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **Security**
  * Safer message rendering via HTML sanitization.
* **Improvements**
  * Updated voice/AI integration for increased reliability and compatibility.
  * General stability and performance enhancements across the app.
* **Chores**
  * Upgraded core libraries, developer tooling, and package manager to latest versions.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->