* Conversation List Item: timestamp bold only when convo has unread
* Preserve the positioning of overlays on re-entry into convo
* ConversationListItem: Handle missing and broken thumbnails
* Shorten timestamp in left pane for better Android consistency
* Update convo last updated if last was expire timer change
But not if it was from a sync instead of from you or from a contact.
* Make links in quotes the same color as the text
* MediaGridItem: Update placeholder icon colors for dark theme
* Ensure turning off timer shows 'Timer set to off' in left pane
* ConversationListItem: Show unread count in blue circle
* Add one pixel margin to blue indicator for text alignment
* Ensure replies to voice message can bet sent successfully
Also:
- New schema version 8 with video/image thumbnails, screenshots, sizes
- Upgrade messages not at current schema version when loading messages
to show in conversation
- New MessageDetail react component
- New ConversationHeader react component
