chore: post-merge redesign fixups

[arnautov-anton]

🎯 Goal

• adjust message reactions positioning (use justify-self instead)
• add reactions host offset for top-based positions
• move thread reply buttons to the message inner for proper bottom-based message reactions positioning
• add reaction list button states and adjust when/how the button is rendered (discuss behavior further)
• add support for thread_participants (thread reply buttons stacked avatar)

[github-actions]

Size Change: +312 B (+0.09%)

Total Size: 338 kB

Filename	Size	Change
./dist/cjs/index.js	199 kB	+136 B (+0.07%)
./dist/css/index.css	33.3 kB	+176 B (+0.53%)

ℹ️ View Unchanged

Filename	Size
./dist/audioProcessing-BbOs2wMd.js	1.32 kB
./dist/Channel-B8wHoVv2.js	21.7 kB
./dist/ChannelPreview-CGB3q1lM.js	7.11 kB
./dist/cjs/emojis.js	2.97 kB
./dist/cjs/experimental.js	3.62 kB
./dist/cjs/mp3-encoder.js	1.27 kB
./dist/css/emojis.css	113 B
./dist/css/v2/emoji-mart.css	1.84 kB
./dist/css/v2/emoji-replacement.css	300 B
./dist/css/v2/index.css	39.4 kB
./dist/css/v2/index.layout.css	22.8 kB
./dist/limits-CtufnTQO.js	3.37 kB

_{compressed-size-action}