fix(studio): show ALL template inputs (bridge V2 content-elements → layers)

The studio parser required scene.layers; a template-created project's scene_data
carries content-elements (scene.contents), so every scene parsed to null and the
editor fell back to the default 2-layer title/subtitle scene. Now parseScene bridges
contents → editable layers (Text→text, Media→image), so all of a scene's inputs
appear (e.g. c1 → 6: 4 text + 2 media). Scene name/duration also read V2 fields.

Remaining studio↔template epic (separate): edit→content-element→AE-render binding,
real AE scene-preview thumbnails, and FIX-mode (hide add-scene).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/studio-scene-data.ts

@@ -43,14 +43,75 @@ function parseLayer(value: unknown): Layer | null {
   };
 }
 
+/**
+ * Bridge a V2 template/saved-project scene (content-element model, no canvas
+ * geometry) into editable studio layers so every input shows in the editor.
+ * Text/TextArea → text layer; Media/Image/Video/Audio → image layer. Laid out in a
+ * column since AE templates carry no canvas coords. One-time on first load; after the
+ * user edits + saves, the scene persists in the studio's own layer format.
+ */
+function layersFromContents(contents: unknown[]): Layer[] {
+  const str = (v: unknown) => (typeof v === "string" ? v : "");
+  const num = (v: unknown) => (typeof v === "number" ? v : undefined);
+  const items = contents.filter(isRecord);
+  items.sort(
+    (a, b) =>
+      (num(a.sort) ?? num(a.positionInContainer) ?? 0) -
+      (num(b.sort) ?? num(b.positionInContainer) ?? 0)
+  );
+  return items.map((c, i) => {
+    const type = str(c.type).toLowerCase();
+    const isMedia = ["media", "image", "video", "audio", "voiceover"].includes(type);
+    const key = str(c.key) || str(c.id) || `el${i}`;
+    const value = str(c.value) || str(c.defaultValue) || str(c.default_value);
+    return {
+      id: `c-${key}`,
+      type: isMedia ? "image" : "text",
+      name: str(c.title) || key,
+      x: 160,
+      y: 160 + i * 150,
+      width: 1600,
+      height: isMedia ? 360 : 110,
+      rotation: 0,
+      opacity: 1,
+      zIndex: i,
+      props: isMedia
+        ? { src: value }
+        : {
+            text: value || (str(c.title) || key),
+            fontSize: 48,
+            fill: "#111827",
+            fontFamily: "Inter, sans-serif",
+            align: "center",
+          },
+    } as Layer;
+  });
+}
+
 function parseScene(value: unknown): Scene | null {
   if (!isRecord(value)) return null;
-  if (typeof value.id !== "string" || typeof value.name !== "string") return null;
+  if (typeof value.id !== "string") return null;
-  if (!Array.isArray(value.layers)) return null;
+  const name =
+    typeof value.name === "string"
+      ? value.name
+      : typeof value.title === "string"
+        ? value.title
+        : typeof value.key === "string"
+          ? value.key
+          : "Scene";
 
-  const layers = value.layers
+  // Studio's own format carries `layers`; a freshly-copied V2 template carries
-    .map(parseLayer)
+  // `contents` (content elements / inputs) instead — bridge those to layers.
-    .filter((layer): layer is Layer => layer !== null);
+  let layers: Layer[];
+  if (Array.isArray(value.layers)) {
+    layers = value.layers
+      .map(parseLayer)
+      .filter((layer): layer is Layer => layer !== null);
+  } else if (Array.isArray(value.contents)) {
+    layers = layersFromContents(value.contents);
+  } else {
+    return null;
+  }
 
   const transitionType =
     typeof value.transitionType === "string" &&
@@ -60,9 +121,15 @@ function parseScene(value: unknown): Scene | null {
 
   return {
     id: value.id,
-    name: value.name,
+    name,
     duration:
-      typeof value.duration === "number" ? value.duration : DEFAULT_SCENE_DURATION,
+      typeof value.duration === "number"
+        ? value.duration
+        : typeof value.sceneLengthSec === "number"
+          ? value.sceneLengthSec
+          : typeof value.defaultDurationSec === "number"
+            ? value.defaultDurationSec
+            : DEFAULT_SCENE_DURATION,
     layers,
     transitionType,
   };