chore: exclude changesets from biome checks

Ignore .changeset metadata files in Biome so release notes are not blocked by formatting rules.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: chillenious

biome.json

@@ -16,6 +16,7 @@
       "!**/.turbo",
       "!**/coverage",
       "!**/.svelte-kit",
+      "!**/.changeset",
       "!**/packages/apps/examples",
       "!**/packages/lib-svelte/config-ui",
       "!**/packages/elements-svelte/multiple-choice/src/configure",