fix(chat-room): 채팅 아이템 UI, 메시지 입력 창 UI

- 채팅 아이템이 화면을 벗어나는 버그 수정
- 메시지 입력창 글자크기 14sp, rounded corner 32dp

app/src/main/res/layout/activity_chat_room.xml

@@ -191,18 +191,22 @@
         <EditText
             android:id="@+id/et_message"
             android:layout_width="0dp"
-            android:layout_height="48dp"
+            android:layout_height="wrap_content"
             android:layout_marginEnd="8dp"
             android:background="@drawable/bg_chat_input"
+            android:fontFamily="@font/pretendard_regular"
             android:hint="@string/chat_input_placeholder"
             android:imeOptions="actionSend|flagNoEnterAction"
+            android:importantForAutofill="no"
             android:inputType="textMultiLine"
             android:maxLength="200"
             android:maxLines="4"
-            android:paddingStart="16dp"
-            android:paddingEnd="16dp"
+            android:minHeight="48dp"
+            android:paddingHorizontal="16dp"
+            android:paddingVertical="8dp"
             android:textColor="#FFFFFFFF"
             android:textColorHint="#80FFFFFF"
+            android:textSize="14sp"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@id/iv_send"
             app:layout_constraintStart_toStartOf="parent"