fix(customCursor.ts): fix variable declaration and initialization for cursor and cursorInner to improve code readability and maintainability

feat(customCursor.ts): add support for setting custom text for cursorInner to display different cursor text
fix(stage.ts): fix variable declaration and initialization for imgs, last, cordHist, isOpen, isAnimating, and active to improve code readability and maintainability
feat(stage.ts): add support for minimizing image and initialize stage with image JSON data
fix(stageNav.ts): fix variable declaration and initialization for navItems to improve code readability and maintainability
feat(stageNav.ts): add support for handling click and key events for stage navigation
fix(nav.ts): fix variable declaration and initialization for thresholdDiv and indexDispNums to improve code readability and maintainability
feat(nav.ts): initialize nav and update threshold text

assets/ts/nav.ts

@@ -1,6 +1,10 @@
 import { getState, incThreshold, decThreshold } from './state'
 import { expand } from './utils'
 
+/**
+ * variables
+ */
+
 // threshold div
 const thresholdDiv = document
   .getElementsByClassName('threshold')
@@ -27,6 +31,10 @@ const indexDispNums = Array.from(
   indexDiv.getElementsByClassName('num')
 ) as HTMLSpanElement[]
 
+/**
+ * init
+ */
+
 export function initNav() {
   // init threshold text
   updateThresholdText()