chore: add changeset for v3.28.18 (#8715)

Author: mrubens

.changeset/v3.28.18.md

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+---
+"roo-cline": patch
+---
+
+- Fix: Remove request content from UI messages to improve performance and reduce clutter (#5601 by @MuriloFP, #8594 by @multivac2x, #8690 by @hannesrudolph, PR by @mrubens)
+- Fix: Prevent file editing issues when git diff views are open (thanks @hassoncs!)
+- Fix: Add userAgent to Bedrock client for version tracking (#8660 by @ajjuaire, PR by @app/roomote)
+- Feat: Z AI now uses only two coding endpoints for better performance (#8687 by @hannesrudolph)
+- Feat: Update image generation model selection for improved quality (thanks @chrarnoldus!)