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/sidebar/tabs/nodeLibrary/CustomNodesPanel.vue

@@ -1,14 +1,14 @@
 <template>
-  <TabsContent value="custom" class="flex-1 flex flex-col h-full">
+  <TabsContent value="custom" class="flex h-full flex-1 flex-col">
     <div
       v-for="(section, index) in sections"
       :key="section.title ?? index"
-      class="flex-1 overflow-y-auto h-full"
+      class="h-full flex-1 overflow-y-auto"
     >
       <!-- Section header -->
       <h3
         v-if="section.title"
-        class="px-4 py-2 text-xs font-medium uppercase tracking-wide text-muted-foreground mb-0"
+        class="mb-0 px-4 py-2 text-xs font-medium tracking-wide text-muted-foreground uppercase"
       >
         {{ section.title }}
       </h3>
@@ -20,7 +20,7 @@
         @node-click="(node) => emit('nodeClick', node)"
       />
     </div>
-    <div class="flex-none py-3 border-t border-border-default text-center">
+    <div class="flex-none border-t border-border-default py-3 text-center">
       <Button
         variant="secondary"
         class="justify-start gap-3"