new utility, less duplicated code

.cursor/rules/codebase-index.mdc

@@ -619,6 +619,15 @@ time-utils.ts
     time: number;
     fps: number;
   }): number
+  export function getSnappedSeekTime({
+    rawTime,
+    duration,
+    fps,
+  }: {
+    rawTime: number;
+    duration: number;
+    fps: number;
+  }): number
 
 transcription-utils.ts
   export function isTranscriptionConfigured()

apps/web/src/hooks/timeline/use-timeline-interactions.ts

@@ -1,7 +1,7 @@
 import { useCallback, useRef } from "react";
 import type { MutableRefObject, RefObject } from "react";
 import { TIMELINE_CONSTANTS } from "@/constants/timeline-constants";
-import { snapTimeToFrame } from "@/lib/time-utils";
+import { getSnappedSeekTime } from "@/lib/time-utils";
 import { useEditor } from "../use-editor";
 
 interface UseTimelineInteractionsProps {
@@ -139,7 +139,11 @@ export function useTimelineInteractions({
       );
 
       const projectFps = activeProject?.settings.fps || 30;
-      const time = snapTimeToFrame({ time: rawTime, fps: projectFps });
+      const time = getSnappedSeekTime({
+        rawTime,
+        duration,
+        fps: projectFps,
+      });
       seek(time);
     },
     [

apps/web/src/hooks/timeline/use-timeline-playhead.ts

@@ -1,4 +1,4 @@
-import { snapTimeToFrame } from "@/lib/time-utils";
+import { getSnappedSeekTime } from "@/lib/time-utils";
 import { useState, useEffect, useCallback, useRef } from "react";
 import { useEdgeAutoScroll } from "@/hooks/timeline/use-edge-auto-scroll";
 import { useEditor } from "../use-editor";
@@ -89,7 +89,7 @@ export function useTimelinePlayhead({
       );
       // use frame snapping for playhead scrubbing
       const fps = activeProject.settings.fps;
-      const time = snapTimeToFrame({ time: rawTime, fps });
+      const time = getSnappedSeekTime({ rawTime, duration, fps });
 
       setScrubTime(time);
       seek(time); // update video preview in real time

apps/web/src/lib/time-utils.ts

@@ -182,3 +182,19 @@ export function snapTimeToFrame({
   const frame = timeToFrame({ time, fps });
   return frameToTime({ frame, fps });
 }
+
+export function getSnappedSeekTime({
+  rawTime,
+  duration,
+  fps,
+}: {
+  rawTime: number;
+  duration: number;
+  fps: number;
+}): number {
+  const snappedTime = snapTimeToFrame({ time: rawTime, fps });
+  const frameOffset = fps > 0 ? 1 / fps : 0;
+  const maxSeekTime =
+    frameOffset > 0 ? Math.max(0, duration - frameOffset) : duration;
+  return Math.max(0, Math.min(maxSeekTime, snappedTime));
+}