fix: control UX — no default tool, launch loader, NPC layout

Deselect effect tools by default and on re-click, block the editor during session launch, and fix NPC overlay/window empty-state layout.

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

app/renderer/shared/npcs/NpcsSceneOverlay.tsx

@@ -342,11 +342,6 @@ function NpcAvatarFrame({
         src={url}
         alt=""
         draggable={false}
-        style={{
-          width: w,
-          height: h,
-          transform: 'translate(-50%, -50%)',
-        }}
         onLoad={(e) => {
           const img = e.currentTarget;
           setNatural({ w: img.naturalWidth || 1, h: img.naturalHeight || 1 });