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/renderer/editor/EditorApp.module.css

@@ -153,7 +153,8 @@
   display: flex;
   align-items: center;
   justify-content: center;
-  z-index: 10000;
+  /* Выше модалок (20001), чтобы прогресс импорта не уходил под диалог выбора. */
+  z-index: 30000;
 }
 
 .editorLockOverlay {
@@ -380,9 +381,14 @@
   width: 100%;
   box-sizing: border-box;
   padding: 8px 10px;
+  padding-right: 28px;
   border-radius: var(--radius-sm);
   border: 1px solid var(--stroke);
-  background: var(--bg0);
+  background-color: var(--bg0);
+  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M2.5 4.25L6 7.75L9.5 4.25' stroke='rgba(255,255,255,0.72)' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
+  background-repeat: no-repeat;
+  background-position: right 8px center;
+  background-size: 12px 12px;
   color: var(--text0);
   font: inherit;
 }