feat(messages): add conversation view JavaScript
Vanilla JS IIFE implementing the full messaging UI frontend:
- ConversationList: render, select, search, update conversations
- ChatView: load/render messages with date separators, scroll-up pagination
- MessageActions: context menu with reply/react/forward/pin/edit/delete
- Reactions: emoji picker, toggle reaction pills
- Composer: Quill editor, Enter to send, file attachments, typing indicator
- SSEClient: EventSource with auto-reconnect (exponential backoff), heartbeat
- Presence: batch fetch, 60s polling, online dot in header
- NewMessageModal: recipient search, pill badges, create conversation
- Pins: pinned bar, overlay list, scroll to pinned message
- Time formatting: Polish locale (teraz, 5 min, wczoraj, date)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Maciej Pienczyn
755520ee62