v0.9.0

This is a major release due to fundamental changes in the underlying Signal
libraries.

🚀 Features

• Add Nix flake for reproducible builds (#474)
• Remove user name alignment at the longest user name (#480)
• Allow to mute channels locally (#484)
• Add and implement delete button mapping (#485)

🐛 Bug Fixes

• Correct message selection with date separators (#468)
• Missing author after date separator (#479)
• Cut off lines (#481)
• Pass absolute path to xdg-open consistently (#482)
• Support old notification config format (#483)
• App stopped working (#495)

🚜 Refactor

• Split app into modules (#475)

⚙️ Miscellaneous Tasks

• Upgrade dependencies (#466)
• Fix typos (#477)

• @chrstnwhlrt made their first contribution in #474