After a server restart, navigating to a previously-visited channel showed
messages at a stale middle position instead of scrolling to the bottom.
The in-memory message cache survived the reconnect, so loadMessages()
bailed (cache hit) and the scroll-to-bottom logic never fired.
Now the ready handler clears the messages and hasMore maps for all
channels belonging to the reconnecting origin (including DMs for home).
The currently open channel is force-reloaded immediately; other channels
get fresh-fetched on next visit, triggering proper scroll-to-bottom.
Also fixes voice channel settings gear icon placement to match text
channels (flex-1 pushes icon to right edge).
Jannis Braun
1c806be94f