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/platform/secrets/components/SecretFormDialog.vue

@@ -74,7 +74,7 @@
         </small>
       </div>
 
-      <span v-if="apiError" class="text-sm text-destructive">
+      <span v-if="apiError" class="text-destructive text-sm">
         {{ apiError }}
       </span>
 

src/platform/secrets/components/SecretListItem.vue

@@ -1,6 +1,6 @@
 <template>
   <div
-    class="flex items-center justify-between rounded-lg border border-border-default bg-base-raised-surface p-4"
+    class="bg-base-raised-surface flex items-center justify-between rounded-lg border border-border-default p-4"
   >
     <div class="flex flex-col gap-1">
       <div class="flex items-center gap-2">
@@ -13,7 +13,7 @@
         />
         <span
           v-else-if="secret.provider"
-          class="rounded-sm bg-base-surface px-2 py-0.5 text-xs text-muted"
+          class="bg-base-surface rounded-sm px-2 py-0.5 text-xs text-muted"
         >
           {{ providerLabel }}
         </span>

src/platform/secrets/components/SecretsPanel.vue

@@ -11,8 +11,8 @@
 
       <Divider class="my-4" />
 
-      <div class="flex items-center justify-between my-4">
-        <h3 class="text-lg font-semibold my-0">
+      <div class="my-4 flex items-center justify-between">
+        <h3 class="my-0 text-lg font-semibold">
           {{ $t('secrets.modelProviders') }}
         </h3>
         <Button @click="openCreateDialog">