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/main/project/assetPrune.test.ts

@@ -22,9 +22,10 @@ void test('collectReferencedAssetIds: превью, видео и аудио', (
       },
     },
     campaignAudios: [{ assetId: 'ca1' as AssetId, autoplay: true, loop: true }],
+    materials: [{ id: 'm1', name: 'Map', assetId: 'mat1' as AssetId }],
   } as unknown as Project;
   const s = collectReferencedAssetIds(p);
-  assert.deepEqual([...s].sort(), ['a1', 'ca1', 'pr', 'th', 'v1'].sort());
+  assert.deepEqual([...s].sort(), ['a1', 'ca1', 'mat1', 'pr', 'th', 'v1'].sort());
 });
 
 void test('reconcileAssetFiles: снимает осиротевшие assets и удаляет файлы', async () => {
@@ -65,12 +66,14 @@ void test('reconcileAssetFiles: снимает осиротевшие assets и
     ...base,
     scenes: {},
     campaignAudios: [],
+    materials: [],
     assets: { orphan: asset } as Project['assets'],
   };
   const next: Project = {
     ...base,
     scenes: {},
     campaignAudios: [],
+    materials: [],
     assets: { orphan: asset } as Project['assets'],
   };
 
@@ -115,7 +118,7 @@ void test('reconcileAssetFiles: удаляет файл при исключен
   } as unknown as Project;
 
   const prev: Project = { ...base, assets: { gone: asset } as Project['assets'] };
-  const next: Project = { ...base, campaignAudios: [], assets: {} as Project['assets'] };
+  const next: Project = { ...base, campaignAudios: [], materials: [], assets: {} as Project['assets'] };
 
   const out = await reconcileAssetFiles(prev, next, tmp);
   assert.deepEqual(out.assets, {});