5.21.0

What's Changed

• Redesign Defaults and Chat settings; fix semantic search, sync churn and workspace duplication by @ProfSynapse in #416
• Fix workspace replay, stale cache reads and search state; refresh image/video models by @ProfSynapse in #417
• Replace Google Veo previews with Gemini Omni Flash; remove retired image/video models by @ProfSynapse in #418
• Make Nano Banana 2.1 the default image model by @ProfSynapse in #419

Full Changelog: 5.20.4...5.21.0