feat(npcs): free rotate overlays and drop session zoom tools

Drag the top-edge handle to rotate the whole frame with the avatar; remove unused zoom controls from the session NPC window.

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

app/shared/types/npcs.ts

@@ -5,6 +5,8 @@ export type NpcsOverlayLayout = {
   cx: number;
   cy: number;
   scale: number;
+  /** Свободный угол поворота, градусы. */
+  rotationDeg: number;
 };
 
 export type NpcsZoomTool = 'zoomIn' | 'zoomOut' | null;
@@ -24,6 +26,7 @@ export const DEFAULT_NPCS_OVERLAY_LAYOUT: NpcsOverlayLayout = {
   cx: 0.5,
   cy: 0.5,
   scale: 1,
+  rotationDeg: 0,
 };
 
 export type NpcsOverlayEvent =
@@ -34,11 +37,19 @@ export type NpcsOverlayEvent =
   | { kind: 'zoomTool.set'; tool: NpcsZoomTool }
   | { kind: 'zoomAt'; nx: number; ny: number; npcId?: NpcId };
 
+/** Нормализация угла в диапазон [0, 360). */
+export function normalizeNpcsRotation(deg: number): number {
+  if (!Number.isFinite(deg)) return 0;
+  const n = deg % 360;
+  return n < 0 ? n + 360 : n;
+}
+
 export function clampNpcsLayout(layout: NpcsOverlayLayout): NpcsOverlayLayout {
   return {
     cx: Math.min(1.2, Math.max(-0.2, layout.cx)),
     cy: Math.min(1.2, Math.max(-0.2, layout.cy)),
     scale: Math.min(8, Math.max(0.15, layout.scale)),
+    rotationDeg: normalizeNpcsRotation(layout.rotationDeg ?? 0),
   };
 }