Vue badge injection broken for JavaScript projects: `openCeltrix` never defined + `className` used in Vue template

[vipul674]

Bug

injectVueBadge() in utils/installer.js only injects the openCeltrix function when it matches a <script setup lang="ts"> block:

content.replace(
  /<script setup lang="ts">([\s\S]*?)<\/script>/,
  ...
)

The create-vue JavaScript template (used when --language javascript) generates <script setup> without lang="ts". So for JS MEVN projects the openCeltrix helper is never added, yet the badge button that calls it is always injected:

<button className="powered-badge" @click="openCeltrix">Powered by ...

Two consequences:

1. Clicking the "Powered by Celtrix" badge throws ReferenceError: openCeltrix is not defined in every JavaScript MEVN / MEVN+tailwind+auth project (mevnSetup, mevnTailwindAuthSetup).
2. The injected button uses className (React JSX style) inside a Vue template, where the attribute must be class. Vue renders className as a literal attribute, so the .powered-badge CSS class never applies — the badge is unstyled in both TS and JS projects.

Note BADGE_VUE in utils/shared.js:99 already contains the correct class="powered-badge" markup, but it is dead code — injectVueBadge hardcodes its own className string instead of using it.

Reproduction

1. celtrix create → choose mevn stack, language javascript
2. cd <project>/client && npm run dev
3. Click the "Powered by Celtrix" badge in HelloWorld.vue

Expected

Badge click opens the Celtrix GitHub repo; badge styled correctly in both JS and TS Vue projects.

Actual

ReferenceError: openCeltrix is not defined (JS) / unstyled badge (all).

Suggested fix

• Make the script-setup regex match <script setup> with or without lang="ts".
• Use class= (or :class) instead of className= in the injected Vue button — prefer reusing BADGE_VUE.

Environment

• celtrix v3.0.1
• Node 18/20

[vipul674]

@JoeCelaster I would like to work on this issue.