Electrum 4.4.6 Release

Critical Lightning Security Fixes:

• Addressed multiple vulnerabilities (See GitHub advisories GHSA-9gpc-prj9-89x7 and GHSA-8r85-vp7r-hjxf)

Lightning Improvements:

• Fixed issue preventing channel sweeping after local-force-close (#8536)
  • New channel backup format (v1) introduced
  • v0 and v1 backups supported for import; only v1 exported
  • Critical: Use updated Electrum for force-close backups
• Resolved MPP sending attempts for unsupported invoices (2cf6173c)

QML GUI Fix:

• Corrected lnurl-pay functionality with thousands separator enabled (5b4df759)

Hardware Wallet Enhancements:

• Trezor: Extended PIN code support to over 9 characters (#8526)
• Jade: Improved compatibility with custom-built DIY devices (#8546)

Build Improvements:

• Added AppStream metainfo.xml to tarballs (#8501)

General Fix:

• Improved exception logging in callbacks (3e6580b9)