style(sync-ui): drop em-dashes from sync window copy

src/syncui/index.html

@@ -37,8 +37,7 @@
           </div>
           <div id="hostList" class="host-list"></div>
           <div id="hostListEmpty" class="empty-note hidden">
-            No saved devices yet — add one below. Hosts you sync from the command line show up here
-            too.
+            No saved devices yet. Hosts you sync from the command line show up here too.
           </div>
         </section>
 
@@ -78,7 +77,7 @@
                 on its PATH, or in <code>~/.local/bin</code>).
               </li>
               <li>
-                Use <em>Test connection</em> to verify both — it checks SSH and the remote launcher
+                Use <em>Test connection</em> to verify both. It checks SSH and the remote launcher
                 in one go.
               </li>
             </ol>
@@ -108,7 +107,7 @@
             </div>
           </div>
           <p class="panel-hint">
-            A snapshot is a consistent point-in-time copy of the immersion database — handy as a
+            A snapshot is a consistent point-in-time copy of the immersion database, handy as a
             manual backup before big merges. Stored in
             <span id="snapshotsDir" class="mono"></span>
           </p>