Collapsed sidebar shows only the status dot; rename Businesses → Business Groups

Collapsed sidebar now hides the network text (running/servers/operators) and
keeps just the centered status dot. Rename the user-facing 'Businesses' label to
'Business Groups' (sidebar, homepage tile, list title/heading/empty state, create
button, profile back-link); route/tab id stay 'businesses'.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

manager/templates/profile.html

@@ -29,7 +29,7 @@
 {% block content %}
 <div class="flex-between" style="margin-bottom: 20px;">
   <div class="flex gap-8">
-    <a href="{{ back }}" class="muted" style="text-decoration:none;">← {{ 'Users' if back == '/users' else ('Businesses' if back == '/businesses' else 'Bots') }}</a>
+    <a href="{{ back }}" class="muted" style="text-decoration:none;">← {{ 'Users' if back == '/users' else ('Business Groups' if back == '/businesses' else 'Bots') }}</a>
     <span class="muted">/</span>
     <strong>{{ profile.name }}</strong>
     <span class="tag {% if profile.bot_type == 'user' %}tag-user{% endif %}">{{ profile.bot_type }}</span>