v0.6.21

## What's Changed
* fix: model-specific vision coordinates for Gemma, Gemini 3.8 Flash and Sonnet 5 by @RasulOs in https://github.com/droidrun/mobilerun/pull/465
* feat: add gpt-6.1-sol and claude-sonnet-5-5, drop gpt-5.5 by @RasulOs in https://github.com/droidrun/mobilerun/pull/468
* chore: drop retired DeepSeek model aliases by @RasulOs in https://github.com/droidrun/mobilerun/pull/469
* fix: strip whitespace from open_app identifiers by @RasulOs in https://github.com/droidrun/mobilerun/pull/471
* chore: release mobilerun 0.6.21 by @RasulOs in https://github.com/droidrun/mobilerun/pull/472
* chore: merge develop into main for 0.6.21 by @RasulOs in https://github.com/droidrun/mobilerun/pull/473


**Full Changelog**: https://github.com/droidrun/mobilerun/compare/v0.6.20...v0.6.21