feat(materials): add campaign materials overlay for sessions

Let GMs manage and show images over the scene from the editor and control panel, with zoom tools, help docs, and full ru/en i18n.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/shared/graph/storylineExportImport.ts

@@ -14,7 +14,7 @@ import type {
   SceneId,
 } from '../types';
 import type { AssetId, ProjectId } from '../types/ids';
-import { asAssetId, asGraphNodeId, asProjectId, asSceneId } from '../types/ids';
+import { asAssetId, asGraphNodeId, asMaterialId, asProjectId, asSceneId } from '../types/ids';
 
 export type StorylineKind = 'main' | 'side';
 
@@ -273,6 +273,7 @@ export function buildPartialExportProject(
     ...draft,
     assets,
     campaignAudios: source.campaignAudios.map((a) => ({ ...a })),
+    materials: (source.materials ?? []).map((m) => ({ ...m })),
     currentSceneId: mainStart?.sceneId ?? firstSide?.sceneId ?? null,
     currentGraphNodeId: mainStart?.id ?? firstSide?.id ?? null,
   };
@@ -287,6 +288,7 @@ function collectReferencedAssetIdsForProject(p: Project): Set<AssetId> {
     for (const au of sc.media.audios) refs.add(au.assetId);
   }
   for (const au of p.campaignAudios) refs.add(au.assetId);
+  for (const m of p.materials ?? []) refs.add(m.assetId);
   return refs;
 }
 
@@ -373,6 +375,7 @@ export function mergeStorylinesIntoProject(
     for (const au of sc.media.audios) neededAssetIds.add(au.assetId);
   }
   for (const au of source.campaignAudios) neededAssetIds.add(au.assetId);
+  for (const m of source.materials ?? []) neededAssetIds.add(m.assetId);
 
   const assetMap = new Map<AssetId, AssetId>();
   const targetSha = new Map<string, AssetId>();
@@ -483,11 +486,35 @@ export function mergeStorylinesIntoProject(
     }
   }
 
+  const materials = [...(target.materials ?? [])];
+  const materialNameKeys = new Set(materials.map((m) => m.name.trim().toLowerCase()));
+  const materialAssetIds = new Set(materials.map((m) => m.assetId));
+  for (const m of source.materials ?? []) {
+    const mapped = assetMap.get(m.assetId) ?? m.assetId;
+    if (materialAssetIds.has(mapped)) continue;
+    let name = m.name.trim();
+    const baseKey = name.toLowerCase();
+    if (materialNameKeys.has(baseKey)) {
+      let n = 2;
+      while (materialNameKeys.has(`${baseKey} (${String(n)})`)) n += 1;
+      name = `${name} (${String(n)})`;
+    }
+    materials.push({
+      id: asMaterialId(`mat_${generateId()}`),
+      name,
+      assetId: mapped,
+      rotationDeg: m.rotationDeg ?? 0,
+    });
+    materialNameKeys.add(name.toLowerCase());
+    materialAssetIds.add(mapped);
+  }
+
   let merged: Project = {
     ...target,
     scenes,
     assets,
     campaignAudios,
+    materials,
     sceneGraphNodes: [...target.sceneGraphNodes, ...newGraphNodes],
     sceneGraphEdges: [...target.sceneGraphEdges, ...newEdges],
   };