Replace all FontAwesome icon usage across 80+ Vue files with lucide-vue-next
components. Remove FontAwesome dependencies (@fortawesome/*) and global
registration from main.ts. Delete unused components (data-table, warning-banner,
session-metadata, bot-sidebar/bot-item in home, message-list, tts-provider-select),
dead utilities (channel-icons.ts, custom-icons.ts), and stale assets (vue.svg).
Update AGENTS.md to reflect the new icon strategy.
Acbox