Refine Browser naming and managed MCP UX

- Rename Browser Use surfaces to Browser
- Register Browser MCP under the new server name
- Mark CloudCLI-managed MCP servers read-only
- Adjust MCP stdio framing and sidebar footer sizing

src/i18n/locales/en/settings.json

@@ -94,7 +94,7 @@
     "git": "Git",
     "apiTokens": "API & Tokens",
     "tasks": "Tasks",
-    "browser": "Browser Use",
+    "browser": "Browser",
     "notifications": "Notifications",
     "plugins": "Plugins",
     "about": "About"
@@ -451,6 +451,10 @@
       "edit": "Edit server",
       "delete": "Delete server"
     },
+    "managed": {
+      "badge": "Managed",
+      "hint": "Managed by CloudCLI — control it from the feature's settings toggle."
+    },
     "help": {
       "title": "About Codex MCP",
       "description": "Codex supports stdio-based MCP servers. You can add servers that extend Codex's capabilities with additional tools and resources."