refactor: remove version update script and related version handling code

src/js/utils/simple-mode-footer.ts

@@ -20,11 +20,6 @@ if (__SIMPLE_MODE__) {
     }
   });
 
-  const versionElement = document.getElementById('app-version-simple');
-  if (versionElement) {
-    versionElement.textContent = APP_VERSION;
-  }
-
   const langContainer = document.getElementById('simple-mode-lang-switcher');
   if (langContainer) {
     const switcher = createLanguageSwitcher();

src/version.ts

@@ -1,18 +0,0 @@
-import packageJson from '../package.json';
-
-export const APP_VERSION = packageJson.version;
-
-export function injectVersion() {
-  const versionElements = document.querySelectorAll('#app-version, #app-version-simple');
-  versionElements.forEach((element) => {
-    element.textContent = APP_VERSION;
-  });
-}
-
-if (typeof document !== 'undefined') {
-  if (document.readyState === 'loading') {
-    document.addEventListener('DOMContentLoaded', injectVersion);
-  } else {
-    injectVersion();
-  }
-}