fix(bug): show collection in dicover section on unfollowed or reload

[Abhishek7Tech]

Closes #2237

Summary

Shows followed Collection is the Discover section after being unfollowed by the user when the page is reloaded, or the page is revisited by the user.

Screen recording

Screen.Recording.2026-08-17.142001.mp4

[greptile-apps]

Greptile Summary

The PR propagates an unfollowed collection ID from the followed section to the Discover section and defers inserting it until active collection requests finish.

• Adds an unfollow callback from collection cards through the collection-section coordinator.
• Prepends the unfollowed collection to the latest Discover results.
• Reruns deferred insertion after initial or pagination loading completes.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/components/organisms/Collections/CollectionCard/CollectionCard.tsx	Propagates the collection ID when the user initiates an unfollow action.
src/components/organisms/Collections/CollectionsSections/CollectionsSections.tsx	Coordinates the latest unfollowed collection ID between Followed and Discover sections.
src/components/organisms/Collections/DiscoverCollections/DiscoverCollections.tsx	Defers insertion during active fetches and retries against the latest visible collection state when loading completes.
src/components/organisms/Collections/FollowedCollections/FollowedCollections.tsx	Passes the unfollow notification callback into followed collection cards.

_{Reviews (2): Last reviewed commit: "fix(bug): show collection in dicover sec..." | Re-trigger Greptile}

[Abhishek7Tech]

@greptileai review