* Fix avatar occasionally stuck in spaceman
## Issue
Sometimes, we'll see a channel profile (e.g. in upper-right, in channel selector) stuck in the fallback Spaceman image.
This is due to OptimizedImage always starting with a blank src, and updated later when the mounted size has been determined. ChannelThumbnail, which uses OptimizedImage, captured the `onError` due to blank src.
## Fix
Don't mount the <img> until the optimum size has been determined.
* FileThumbnail: skip resolve if thumbnail url is specified
* UriIndicator: skip resolve if channel info is specified
* Notifications: disable batch resolve + use fetched data if available + fallback to resolve if n/a
The fallback is using the individual resolve when no direct data is provided and claim is undefined.
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