feat(gui): surface per-target quota state in combo workspace (#1702)

[lidge-jun]

Summary by CodeRabbit

• New Features
  • Added quota status visibility for combo targets, including exhausted-provider badges.
  • Added alerts when all targets in a combo have exhausted quota.
  • Combo overview attention indicators now include quota-related warnings.
  • Quota information is refreshed while the Combos page is active.
• Localization
  • Added translated quota-exhaustion messages in English, German, Japanese, Korean, Russian, Turkish, Simplified Chinese, and Traditional Chinese.
• Style
  • Added light and dark theme styling for quota badges and exhaustion alerts.