feat(npcs): add groups, storyline bindings, and Foundry import

Nested NPC groups with color, graph filter, and scene/storyline binding; Foundry worlds/modules import actors into groups; storyline merge asks on NPC name conflicts and reports NPC counts.

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

app/shared/graph/storylineExportImport.test.ts

@@ -61,7 +61,7 @@ function minimalProject(overrides: Partial<Project> = {}): Project {
       updatedAt: '2020-01-01T00:00:00.000Z',
       createdWithAppVersion: '1',
       appVersion: '1',
-      schemaVersion: 8,
+      schemaVersion: 9,
     },
     scenes: {},
     sceneListOrder: [],
@@ -69,6 +69,7 @@ function minimalProject(overrides: Partial<Project> = {}): Project {
     campaignAudios: [],
     materials: [],
     npcs: [],
+    npcGroups: [],
     npcRelations: [],
     currentSceneId: null,
     currentGraphNodeId: null,