Persists the font family/size from a sent formatted message to the
settings DataStore (SettingsRepository.setLastFont), taking the
message-wide base style if set, else the last FontFamily/FontSize
span. Brand-new compositions (draftId == null) seed a RichBaseStyle
from the remembered preference so the whole message defaults to it;
resumed drafts and replies/forwards are untouched, and messages with
no remembered font stay plaintext-only.
Closes#78
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
5e5116cbca