message_row: Shrink sender_info_hover region.

The sender_info_hover region incorrectly filled the full row to the
right of the sender's name, resulting in the blue highlight being
visible in parts of the message that should be just the message body.

Fix this by moving the selectors for it further down in the DOM.

Fixes #25276.

web/templates/me_message.hbs

@@ -1,8 +1,6 @@
 <span class="message_sender no-select is_me_message">
-    <span class="sender_info_hover">
-        <span>
-            {{> message_avatar}}
-        </span>
+    <span>
+        {{> message_avatar}}
     </span>
 
     <span class="sender-status">

web/templates/message_avatar.hbs

@@ -1,4 +1,4 @@
-<div class="u-{{msg/sender_id}} inline_profile_picture {{#sender_is_guest}} guest-avatar{{/sender_is_guest}} view_user_card_tooltip" aria-hidden="true">
+<div class="u-{{msg/sender_id}} sender_info_hover inline_profile_picture {{#sender_is_guest}} guest-avatar{{/sender_is_guest}} view_user_card_tooltip" aria-hidden="true">
     <img src="{{small_avatar_url}}" alt="" class="no-drag"/>
 </div>
 {{~! remove whitespace ~}}

web/templates/message_body.hbs

@@ -1,9 +1,9 @@
 {{#unless status_message}}
-<span class="message_sender sender_info_hover no-select">
+<span class="message_sender no-select">
     {{#if include_sender}}
     <span>
         {{> message_avatar ~}}
-        <span class="sender_name auto-select" role="button" tabindex="0">
+        <span class="sender_info_hover sender_name auto-select" role="button" tabindex="0">
             <span class="sender_name_padding view_user_card_tooltip"></span>
             <span class="view_user_card_tooltip">{{msg/sender_full_name}}{{> status_emoji msg/status_emoji_info}}</span>
         </span>