Refactor compact post view

[hjiangsu]

Pull Request Description

This PR refactors parts of the compact post view card to improve readability and potentially performance! Similar to the MediaView refactor, there may be follow-up PRs for additional changes. For now, the main updates include:

• Renamed TypeBadge to MediaTypeBadge and applied some optimizations.
• Extracted ThumbnailPreview into its own file (previously in post_card_view_compact.dart) and renamed it to CompactThumbnailPreview. Like MediaView, this widget no longer depends on PostViewMedia.
• Introduced a new PostStatusIcon widget (and additionally, a new enum PostStatus) to handle post statuses (e.g., locked, hidden, deleted, removed) next to the post title. This can later be used in the card post view widget to reduce code duplication.
• Introduced a new PostCardTitle widget which generates the entire post title (alongside the statuses using PostStatusIcon) - this can eventually be shared with all the different post card types (e.g., card, compact)

Issue Being Fixed

Issue Number: N/A

Screenshots / Recordings

Checklist

• If a new package was added, did you ensure it uses an appropriate license and is actively maintained?
• Did you use localized strings (and added appropriate descriptions) where applicable?
• Did you add semanticLabels where applicable for accessibility?

[hjiangsu]

I'll be merging this in first - do let me know if there's any issues with this @micahmo!