0.10.1: audio clip push-cascade + track-swap ghost, Media drawer rename

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/stores/scene.ts

@@ -1666,6 +1666,50 @@ export const useSceneStore = defineStore('scene', {
       }
     },
 
+    /** Move a clip to `(startTime, audioTrackId)` on the active page and
+     *  cascade-push any existing clips on the target track out of the way
+     *  (forward in time) so no overlap survives. Clips that end BEFORE
+     *  the moved clip's new startTime are left alone. Returns `false`
+     *  when the clip or target track is unknown. */
+    setAudioClipPosition(id: string, startTime: number, audioTrackId?: string): boolean {
+      const page = this.activeScene
+      const clip = page.audioClips.find((c) => c.id === id)
+      if (!clip) return false
+      const targetTrackId = audioTrackId ?? clip.audioTrackId
+      const targetTrack = page.audioTracks.find((t) => t.id === targetTrackId)
+      if (!targetTrack) return false
+
+      const lenOf = (c: AudioClip): number => {
+        const a = this.project.assets.find((x) => x.id === c.audioAssetId)
+        if (!a || a.kind !== 'audio') return 0
+        return Math.max(0, a.duration - (c.trimStart ?? 0) - (c.trimEnd ?? 0))
+      }
+
+      const newStart = Math.max(0, startTime)
+      const clipLen = lenOf(clip)
+
+      // Anything already on the target track, minus the one we're moving.
+      const others = page.audioClips
+        .filter((c) => c.audioTrackId === targetTrackId && c.id !== id)
+        .slice()
+        .sort((a, b) => a.startTime - b.startTime)
+
+      let floor = newStart + clipLen
+      for (const other of others) {
+        const len = lenOf(other)
+        // Clip entirely before the moved block — no cascade needed.
+        if (other.startTime + len <= newStart) continue
+        // Overlapping or sitting past the moved block but below the
+        // rolling floor → push it forward to the floor.
+        if (other.startTime < floor) other.startTime = floor
+        floor = other.startTime + len
+      }
+
+      clip.audioTrackId = targetTrackId
+      clip.startTime = newStart
+      return true
+    },
+
     /** Trim from the head and/or tail of an audio clip. Keeps the audible
      *  block at least `MIN_VISIBLE` (0.05s) long — mirrors trimClipInstance. */
     trimAudioClip(