feat: Refactor document drag initiation and state management with new session handling and geometry utilities. (slightly broken)

frontend/src/utils/math.ts

@@ -15,7 +15,11 @@ export const formatTransform = (
   scale = 1,
 ): string => `translate3d(${x}px, ${y}px, 0) rotate(${rotation}deg) scale(${scale})`;
 
+export const toNumber = (v: unknown, fallback = 0): number =>
+  Number.isFinite(Number(v)) ? Number(v) : fallback;
+
 export default {
   clamp,
   formatTransform,
+  toNumber,
 };