Rework section loading in project-detail

[marktaipan-cvisionai]

Category Feature Request

Problem When applying a search, the old media cards persist and the only UI indication that something is happening is the spinning refresh/reload icon. This icon is small and it can be difficult for users to see that the query is happening and the cards are stale.

Request

• Be more obvious that the query is going on. Having a more distinct loading message.
• Keeping the old cards there makes it misleading that they match the filter query.
• Put in skeleton cards / some waiting animation. Would be good to have a cancel query button too so the user can quickly get out of the query state. This can be done by clearing out the filter conditions and hitting re-apply, but it's unclear what happens if there are multiple queries in flight and how the page would handle those responses.

[marktaipan-cvisionai]

Should look into emulating the spinner logic that is happening in the localization gallery. However, the localization gallery does not have a cancel option, and we may likely want that here.