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src/lib/timelineSnap.ts

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+export interface SnapOptions {
+  enabled: boolean
+  pxPerSec: number
+  pixelThreshold: number
+  duration: number
+}
+
+export function snapToCandidates(
+  t: number,
+  candidates: readonly number[],
+  opts: SnapOptions,
+): number {
+  if (!opts.enabled) return t
+  if (opts.pxPerSec <= 0) return t
+  const thresholdTime = opts.pixelThreshold / opts.pxPerSec
+  let best = t
+  let bestDist = thresholdTime
+  for (const kt of candidates) {
+    const d = Math.abs(kt - t)
+    if (d <= bestDist) {
+      bestDist = d
+      best = kt
+    }
+  }
+  return Math.max(0, Math.min(opts.duration, best))
+}