refactored and condensed technical documentation and comments across the codebase to improve readability

lib/widget/emoji_text.dart

@@ -2,11 +2,9 @@ import 'package:flutter/material.dart';
 
 /// Central place for rendering emoji glyphs (reactions, pickers, …).
 ///
-/// Emojis used to be drawn as bare `Text(emoji)` widgets all over the Talk UI,
-/// which meant they inherited the small default body text size and looked
-/// inconsistent. [EmojiText] gives every emoji a uniform, comfortably large
-/// size and forces the platform's color-emoji font so the rendering is the same
-/// everywhere.
+/// Gives every emoji a uniform, comfortably large size and forces the
+/// platform's color-emoji font, so rendering stays consistent everywhere —
+/// bare `Text(emoji)` inherited the small body size and looked inconsistent.
 class EmojiText extends StatelessWidget {
   /// Size for emojis shown inline next to other text, e.g. reaction chips.
   static const double sizeInline = 15;