feat: sync social action updates from local main

[Shin-Aska]

Summary

• Add subscription-driven social action metric updates to post cards.
• Improve Bluesky reply creation and returned post metadata.
• Include the heart, reply, and App View regression scenarios committed locally on September 26.

Commits

• b37b3dd test: add scenarios for heart and reply actions without page refresh
• e43878d feat: add support for social action listeners with subscription API
• 9205bb3 test: add cases for Bluesky reply handling with and without App View
• 6302514 feat: enhance Bluesky reply action with improved post creation and metadata
• 146ee0e feat: add dynamic metrics updates via social action subscription API

[Shin-Aska]

Closing this temporary main-sync PR after confirming the five commits are already included in feature/0.1.2.