build: pnpm + Docusaurus 3.9.2

[metabrixkt]

• build: Migrate to pnpm
• build: Update caniuse-lite
• build: Docusaurus 3.9.2

[Copilot]

Pull Request Overview

This PR upgrades Docusaurus and related dependencies, enforces pnpm as the package manager, and updates the configuration for Docusaurus v3.9 compatibility.

• Upgraded Docusaurus from v3.5.2 to v3.9.2
• Added pnpm enforcement and workspace configuration
• Updated onBrokenMarkdownLinks configuration to align with Docusaurus v3.9+ structure

Reviewed Changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 1 comment.

File	Description
pnpm-workspace.yaml	Adds workspace configuration specifying dependencies that should only be built
package.json	Updates dependencies to v3.9.2, adds pnpm enforcement script
docusaurus.config.js	Migrates onBrokenMarkdownLinks from top-level to markdown.hooks configuration

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