android: refresh chat screen header and composer baseline

android/CHANGELOG.md

@@ -826,3 +826,15 @@
 - Added notification cleanup on chat open:
   - when push-open intent targets a chat in `MainActivity`,
   - when `ChatViewModel` enters a chat directly from app UI.
+
+### Step 119 - Chat screen visual baseline (Telegram-like start)
+- Reworked chat top bar:
+  - icon back button instead of text button,
+  - cleaner title/subtitle styling,
+  - dedicated search icon in top bar (inline search is now collapsible).
+- Updated pinned message strip:
+  - cleaner card styling,
+  - close icon action instead of full text button.
+- Updated composer baseline:
+  - icon-based emoji/attach/send/mic controls,
+  - cleaner container styling closer to Telegram-like bottom bar.