app_store improvements

[bitful-pannul]

Problem

https://github.com/kinode-dao/kinode/issues/592

• current capabilities aren't displayed quite correctly.
• no pending auto_updates notifications, ability to re-approve caps and install!
• empty file gets written by receiving file_transfer_worker even if no chunks come in
• upon sender not mirroring a version, or simply not having it available, no response bubbles up to receiver.

Solution

WIP!

• ManifestDisplay with expandable processes and their requested caps (and other metadata) [x]
• NotificationBay, including errors and success messages [x]
• auto_updates as notifs too!
• non-await response sent by sender, receiver matches on context, and forwards via ws to UI in case of errors. [x]

Notes