chore: add changeset for snap overlay spacing polish

Author: bob-obringer

.changeset/quiet-snaps-breathe.md

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+---
+"@farcaster/snap": patch
+---
+
+Polish Snap renderer spacing and image overlay readability.
+
+- Improve React Native image title/subtitle overlays without adding a native gradient dependency: lighter text plate, tighter bottom-left placement, and crisper text shadow.
+- Improve web image overlay readability for busy backgrounds.
+- Reduce the largest normal-flow Snap text by 1px on web and React Native, including item titles, while leaving image overlay title/subtitle sizing unchanged.
+- Make plain item groups with no border and no separator default to zero item gap. Explicit `gap` props continue to take precedence.