0.2.0 — Version tracking & changelog

What's new

• Live version detection. Every five minutes the app checks whether a newer build is available and shows a toast inviting you to refresh. Hidden tabs don't poll; visible tabs catch up the moment you switch back.
• Cross-tab dismiss. If you tell one tab "I'll refresh later," your other tabs respect that. Refusing once doesn't get re-asked until the next release lands.
• Changelog page. Every release has its own entry here. The in-app Changelog widget mirrors the same content.

Under the hood

• The deployed bundle now carries its build version + git SHA.
• A static version.json ships with each deploy as the source of truth for "what's live right now."
• Cache-Control headers were tightened on /, /index.html, and /version.json so revalidation is reliable.

What's next

• Major-version bumps will switch from toast → modal, with the breaking changes called out inline.
• The changelog widget will gain filtering by tag.