Simplify native development commands

[kostyafarber]

Summary

• add explicit debug/release Electron development workflows:
  • pnpm dev
  • pnpm dev:release
  • pnpm dev:watch
  • pnpm dev:watch:release
• make Rust watch mode select the native build profile, watch the Cargo workspace, and avoid a duplicate startup build
• remove the redundant root build command, ineffective Turbo native/dev tasks, and unused test:ci / test:typecheck aliases
• update setup and command documentation for Node 24 and pnpm 11

Testing

• repository pre-commit hooks
• JSON parsing for package.json and turbo.json
• bash -n scripts/watch.sh
• invalid watch-profile exit/usage check
• git diff --check