- Implement mobile view state management (`list` vs `thread`) in `ProfileModalController`.
- Update `AppShell` to apply `data-dm-view` attribute for CSS toggling.
- Update `MessageThread` to render a "Back" button on mobile.
- Add CSS rules to hide/show sidebar and thread panels based on mobile view state.
- Ensure desktop layout remains split-pane.
Explicitly set `size: "md"` in ContactRow and added `min-width` / `min-height` to avatar CSS classes to prevent flexbox squashing. This ensures consistent avatar rendering in the conversations column.
- Maximized profile modal to be full-screen for better content visibility.
- Cleaned up DM conversation list by removing message previews and timestamps.
- Updated DM badges and outgoing messages to use theme accent color instead of generic blue.
- Refactored DM composer to move privacy and zap toggles into a "More" menu.