refactor: remove dead code

Delete unused components, hooks and utilities that have no remaining references, and drop their now-unused exports (augmentations/string, Number.prototype.hoursToMilliseconds). Also drop the dangling ExampleGlobalModalUsage reference from GLOBAL_MODAL_GUIDE.md.

augmentations/number.ts

@@ -3,7 +3,6 @@ declare global {
     bytesToReadable(decimals?: number): string;
     secondsToMilliseconds(): number;
     minutesToMilliseconds(): number;
-    hoursToMilliseconds(): number;
   }
 }
 
@@ -28,8 +27,4 @@ Number.prototype.minutesToMilliseconds = function () {
   return this.valueOf() * (60).secondsToMilliseconds();
 };
 
-Number.prototype.hoursToMilliseconds = function () {
-  return this.valueOf() * (60).minutesToMilliseconds();
-};
-
 export {};