Discogs Copilot ext-v0.3.1 — sign-out polish

Patch from live QA of ext-v0.3.0:

• App bar no longer claims "connected" after sign-out — the "● username · connected" line is now taken down whenever a signed-out view renders, and returns on the next home-screen load
• Pairs with server v1.3.1, which makes the home screen's collection/wantlist counts near-live (15-min freshness) instead of up to 4 h stale

Update (load-unpacked): git pull, then Reload (↻) the extension in chrome://extensions — no re-auth needed.

Full Changelog: ext-v0.3.0...ext-v0.3.1