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/npcs/NpcsApp.tsx

@@ -214,22 +214,21 @@ export function NpcsApp() {
 
   return (
     <div className={styles.page}>
-      {hasActive ? (
-        <div className={styles.toolbar}>
-          <div className={styles.toolbarRow}>
-            <Button
-              title={t('npcs.closeOverlay')}
-              ariaLabel={t('npcs.closeOverlay')}
-              tooltipPlacement="bottom"
-              onClick={() => {
-                void overlayApi.dispatch({ kind: 'hide' });
-              }}
-            >
-              {t('npcs.closeOverlay')}
-            </Button>
-          </div>
+      <div className={styles.toolbar}>
+        <div className={styles.toolbarRow}>
+          <Button
+            title={t('npcs.closeOverlay')}
+            ariaLabel={t('npcs.closeOverlay')}
+            tooltipPlacement="bottom"
+            disabled={!hasActive}
+            onClick={() => {
+              void overlayApi.dispatch({ kind: 'hide' });
+            }}
+          >
+            {t('npcs.closeOverlay')}
+          </Button>
         </div>
-      ) : null}
+      </div>
 
       <div className={styles.body}>
         <div className={styles.detail}>
@@ -264,8 +263,10 @@ export function NpcsApp() {
               );
             })
           ) : (
-            <div className={styles.detailEmpty}>
-              {npcs.length === 0 ? t('npcs.windowEmpty') : t('npcs.selectToShow')}
+            <div className={styles.detailCard}>
+              <div className={styles.detailEmpty}>
+                {npcs.length === 0 ? t('npcs.windowEmpty') : t('npcs.selectToShow')}
+              </div>
             </div>
           )}
         </div>