fix: enable enforce-consistent-class-order tailwind lint rule (#9428)

## Summary

Enable `better-tailwindcss/enforce-consistent-class-order` lint rule and
auto-fix all 1027 violations across 263 files. Stacked on #9427.

## Changes

- **What**: Sort Tailwind classes into consistent order via `eslint
--fix`
- Enable `enforce-consistent-class-order` as `'error'` in eslint config
- Purely cosmetic reordering — no behavioral or visual changes

## Review Focus

Mechanical auto-fix PR — all changes are class reordering only. This is
the largest diff but lowest risk since it changes no class names, only
their order.

**Stack:** #9417 → #9427 → **this PR**

Fixes #9300 (partial — 3 of 3 rules)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9428-fix-enable-enforce-consistent-class-order-tailwind-lint-rule-31a6d73d3650811c9065f5178ba3e724)
by [Unito](https://www.unito.io)

src/components/helpcenter/HelpCenterMenuContent.vue

@@ -33,7 +33,7 @@
           <span class="menu-label">{{ menuItem.label }}</span>
           <i
             v-if="menuItem.showExternalIcon"
-            class="icon-[lucide--external-link] text-primary size-4 ml-auto"
+            class="ml-auto icon-[lucide--external-link] size-4 text-primary"
           />
           <i
             v-if="menuItem.key === 'more'"