v0.2.1 — Provider Auth Fixes

Fixes

• Provider auth sync: window reload after pi /login so provider list refreshes
• Provider toggle: login/logout + reload QuickPick after auth changes
• Model filtering: only show models from authenticated providers (from auth.json)

Docs

• 8 Playwright screenshots (welcome, chat, tools, thinking, edits, workflow, slash commands, model picker)
• README rewritten with installation guide, screenshot gallery, badges