Version 2.0 — Full Pulse Release

This is a major update introducing Pulse, a personal reading
companion built into the extension.

Pulse quietly remembers your DJs Mobiles journey. It knows
when you started following, notices when you return after time
away, and builds a picture of what you care about as a reader.
Everything stays on your device — nothing is stored externally.

What's new:
- Pulse panel with dynamic heading — changes based on how long
you have been away
- Weekly Pulse — story count, active days, your top interests
- Continue Reading — three recent articles at a glance
- Reader stats — articles read, visits, favourite brand and topic
- Conversation engine — personalised greeting on every return
- Reading history recorded quietly in the background
- Dark mode with persistent preference
- Feed dims when Pulse panel is open
- Escape key and click-to-dismiss on Pulse panel