Android v0.2.0

• QR (nostrconnect) login is now available on Android — sign in with a signer app on another phone, or tap the QR to connect with Amber on this device
• bunker URL can now be scanned with the camera — no more copying secret strings through messengers
• bunker connect times out after 60s instead of hanging forever
• Fixed: retry button after a failed Amber login; spurious timeout error when switching login tabs