tinySSB apk v0.2.3-alpha 20250115

This release includes the new trust level functionality:

• level 0 = locally discovered feeds are untrusted (red) and will be forgotten after some time
• level 1 = manually trusting such a feed will make it persistent and bump its trust level (orange)
• level 2 = scanning the other device's QR code containing the public key will make it a verified contact (green)
• a trusted or verified contact can always be demoted (decrease its trust level)