chore: add changeset for v3.26.1 (#7459)

.changeset/v3.26.1.md

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+---
+"roo-cline": patch
+---
+
+- Add Vercel AI Gateway provider integration (thanks @joshualipman123!)
+- Enable on-disk storage for Qdrant vectors and HNSW index for improved performance (thanks @daniel-lxs!)
+- Fix: Remove duplicate cache display in task header (thanks @mrubens!)
+- Random chat text area cleanup for better UI experience (thanks @cte!)