Enh/unified auth

[goanpeca]

Fixes datalayer/vscode-datalayer#42

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[Copilot]

Pull request overview

This PR implements a unified authentication system for the Datalayer platform, providing consistent authentication flows across TypeScript (browser/Node.js) and Python SDKs. The enhancement addresses issue #42 by introducing an AuthenticationManager class with multiple authentication strategies (token, credentials, storage, and OAuth).

Key Changes

• Unified Authentication Architecture: Introduces AuthenticationManager classes in both TypeScript (src/client/auth/) and Python (datalayer_core/sdk/auth/) with strategy pattern for token, credentials, storage-based, and browser OAuth authentication
• New Login Components: Adds Login and LoginToken React components with form validation, OAuth integration, and token input support
• CLI Refactoring: Updates authentication commands (login, logout, whoami) to use the new SDK authentication manager instead of direct API calls
• Dependency Updates: Adds authentication-related dependencies including keytar for secure token storage, new JupyterLab packages, and additional UI libraries

Reviewed changes

Copilot reviewed 38 out of 39 changed files in this pull request and generated 35 comments.

Show a summary per file

File	Description
src/client/auth/*.ts	New TypeScript authentication module with manager, strategies, storage backends, and types
src/components/auth/*.tsx	New Login and LoginToken React components with form validation and OAuth support
datalayer_core/sdk/auth/*.py	New Python authentication module mirroring TypeScript implementation
datalayer_core/cli/commands/authn.py	Refactored CLI commands to use SDK authentication manager
package.json	Added authentication dependencies (keytar, JupyterLab packages)
src/tools/adapters/agui/*.tsx	Temporary placeholders for jupyter-react exports until available
pyproject.toml	Added mypy overrides for tornado and chat handlers

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[echarles]

LGTM Thx @goanpeca