fix(MessageList): prevent message pagination too early on mount

[MartinCupela]

🎯 Goal

Prevent pagination while the MessageList content is being mounted with the initial page content

It solves a threshold/race issue where:

• At viewport height 941px, message list bottom offset is 250, so no extra pagination fires; list stays at bottom.
• At viewport height 942px, bottom offset becomes 249, which is < 250, so reverse infinite-scroll treats it as “near top” and auto-loads older messages.

[github-actions]

Size Change: +75 B (+0.01%)

Total Size: 619 kB

📦 View Changed

Filename	Size	Change
dist/cjs/index.js	240 kB	+39 B (+0.02%)
dist/es/index.mjs	239 kB	+36 B (+0.02%)

ℹ️ View Unchanged

Filename	Size
dist/cjs/audioProcessing.js	1.32 kB
dist/cjs/emojis.js	3.01 kB
dist/cjs/mp3-encoder.js	1.27 kB
dist/cjs/WithAudioPlayback.js	44.7 kB
dist/css/emoji-picker.css	178 B
dist/css/emoji-replacement.css	456 B
dist/css/index.css	39.3 kB
dist/es/audioProcessing.mjs	1.31 kB
dist/es/emojis.mjs	2.52 kB
dist/es/mp3-encoder.mjs	756 B
dist/es/WithAudioPlayback.mjs	44.5 kB

_{compressed-size-action}