Osaurus 0.21.6

What's Changed

• Persist user turns before chat streaming (#1851) by @mimeding
• Handle empty voice transcriptions (#1831) by @mimeding
• Persist user turns before chat streaming (#1830) by @mimeding
• Update Simplified Chinese and Traditional Chinese translations (#1820) by @ftzahao
• Redesign Agent Channels settings as the Channels tab (#1827) by @tpae
• Fix task progress overlay menu bar placement (#1825) by @mimeding
• Polish Slack and Telegram Agent Channels (#1808) by @mimeding

🐛 Bug Fixes

• fixed mistral remote provider reasoning support (#1847) by @RaajeevChandran
• fixed subagent feed hang (#1832) by @RaajeevChandran

🧰 Maintenance

• Eval matrix chat-model/subsystem split, delegation cases, and outcome-based frontier rubrics (#1853) by @tpae
• Start Sparkle update checks at app launch (#1849) by @tpae
• Local-model harness fixes from the gemma-4-E4B loop + full-coverage 3-way matrix (#1826) by @tpae
• Harden Slack/Telegram Agent Channels after the PR #1808 audit (#1824) by @tpae

Full Changelog: 0.21.5...0.21.6