2023.10.4

• UX: fetch account when mention component is rendering
• UX: "missing" account now show missing image icon as avatar next to user mention
• Status: avatar size adjust depending on status' text size (kinda, currently only check for large text size)
• Timeline: make home, local, fediverse, and remote (instance) timeline layout more consistent with the other pages
• Timeline: move pin button to remote (instance) timeline's header
• Search: move search icon to the start of textbox
• UI: changed how user acct is rendered, domain now shown as button (similar to Thread)
• Mention: fix mention doesn't have underline on hover
• UI: changed default font to Nunito Sans
• Dev: migrate l10n to Project Fluent (partially, we'll migrate slowly while working on other changes)