Reminder of tab-enter to send.

I'd like to phase this out in favor of something you actually
see only when you don't use Tab-Enter, but that's more challenging
than I'm prepared to tackle right this second.

(imported from commit eeda53b0ed69d0e528b00ea9e7c7a20edb35df34)

templates/zephyr/home.html

@@ -104,6 +104,7 @@
                   </div>
                   <div tabindex="151" onfocus="ui.safari_composebox_workaround();"></div>
                 </div>
+                <div id="tab-enter-message">(Send with Tab, then Enter)</div>
               </td>
             </tr>
           </tbody>

zephyr/static/styles/zephyr.css

@@ -273,7 +273,9 @@ blockquote p {
 }
 
 #send_message_form .messagebox {
-    padding-right: 5px; /* normally 5px 14px; pull in the right a bit */
+    /* normally 5px 14px; pull in the right and bottom a bit */
+    padding-right: 5px;
+    padding-bottom: 0px;
     cursor: default;
 }
 
@@ -282,6 +284,13 @@ blockquote p {
     margin-right: 0px;
 }
 
+#tab-enter-message {
+    display: table-row;
+    font-size: 80%;
+    white-space: nowrap;
+    text-align: right;
+}
+
 .messagebox p {
     margin-bottom: 5px;
 }
@@ -391,6 +400,7 @@ textarea.new_message_textarea {
     width: 99%;
     min-height: 40px;
     max-height: 150px;
+    margin-bottom: 0px;
     resize: none;
 }
 
@@ -413,7 +423,6 @@ input.recipient_box {
     display: table-cell;
     vertical-align: bottom;
     padding-left: 21px;
-    padding-bottom: 9px;
     /* jQuery's slideDown() animation seems to compute the target height by
        drawing these elements in an (offscreen) context where they would reflow
        onto multiple lines.  We need to prevent that in order to avoid an