Add emoji reaction tapback support

[WesleyBlack]

Demo.mov

This PR address issue #190. For transparency I did use AI and Quik's implementation to help build this feature. I plan to add support for sending reactions as well, but if this is something you don't want I will refrain from pushing this type of PR.

Summary

• Parse Apple tapback and Google Messages reaction text into inline emoji reactions on message bubbles.
• Hide converted reaction messages from the thread and suppress reaction-only notifications when they collapse successfully.
• Add reaction chip styling and a long-press dialog showing who reacted.

Test plan

• Ran ./gradlew assembleCoreDebug.
• Tested and confirmed operation on local Android phone

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