style(settings): align updates section with app UI patterns

packages/app/src/utils/desktop-updates.test.ts

@@ -76,7 +76,7 @@ describe('desktop-updates helpers', () => {
 
     expect(formatVersionWithPrefix('0.2.0')).toBe('v0.2.0')
     expect(formatVersionWithPrefix('v0.2.0')).toBe('v0.2.0')
-    expect(formatVersionWithPrefix(null)).toBe('Unavailable')
+    expect(formatVersionWithPrefix(null)).toBe('\u2014')
   })
 
   it('prefers localhost direct host when selecting local daemon', async () => {

packages/app/src/utils/desktop-updates.ts

@@ -137,7 +137,7 @@ export function isVersionMismatch(
 export function formatVersionWithPrefix(version: string | null | undefined): string {
   const value = version?.trim()
   if (!value) {
-    return 'Unavailable'
+    return '\u2014'
   }
 
   return value.startsWith('v') ? value : `v${value}`