feat(cli): add hostname to footer with smart visibility

- Add hostname to footer ALL_ITEMS and DEFAULT_ORDER
- Implement smart visibility for hostname (only show when remote/container)
- Shorten hostname to first segment to save space
- Fix vimEnabled destructuring in Footer.tsx

Fixes https://github.com/google-gemini/gemini-cli/issues/25661

packages/cli/src/config/footerItems.ts

@@ -22,6 +22,11 @@ export const ALL_ITEMS = [
     header: 'sandbox',
     description: 'Sandbox type and trust indicator',
   },
+  {
+    id: 'hostname',
+    header: 'host',
+    description: 'System hostname (only shown when remote or in a container)',
+  },
   {
     id: 'model-name',
     header: '/model',
@@ -70,6 +75,7 @@ export const DEFAULT_ORDER = [
   'workspace',
   'git-branch',
   'sandbox',
+  'hostname',
   'model-name',
   'context-used',
   'quota',
@@ -87,6 +93,7 @@ export function deriveItemsFromLegacySettings(
     'workspace',
     'git-branch',
     'sandbox',
+    'hostname',
     'model-name',
     'quota',
   ];