0.2.1 release

Changelog 0.2.1 Added official plugin marketplace tab with square plugin cards and fullscreen plugin details. Added GitHub plugin install flow from GitHub repository URL / plugin.json. Added built-in GitHub Device Flow login, no GitHub CLI required. Added local encrypted plugin auth storage via Electron safeStorage when available. Added automatic GITHUB_TOKEN injection into Plugin MCP servers. Added GitHub Git Operator v0.1.1. Added GitHub tools: list repos, clone, status, log, commit, push. Fixed clone argument handling: model can use repoUrl, repo, repository, or url. Added token-based GitHub clone/push support. Added controlled execution layer: permissions, dry-run, execution log, sandbox-per-task option, approval gates, evaluator pass. Added plugin trust/risk labels and clearer permission display. Added artifact support, image history/gallery, personal memory, project templates, task queue UI pieces. Added setup wizard improvements and provider presets. Added smoother UI animations and custom LAS select controls. Added Linux packaging via .tar.gz. Rebuilt Windows installer with the updated plugin catalog.