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/AssetsSidebarTab.vue

@@ -50,7 +50,7 @@
         v-model:sort-by="sortBy"
         v-model:view-mode="viewMode"
         v-model:media-type-filters="mediaTypeFilters"
-        class="pb-1 px-2 2xl:px-4"
+        class="px-2 pb-1 2xl:px-4"
         :show-generation-time-sort="activeTab === 'output'"
       />
       <Divider type="dashed" class="my-2" />
@@ -118,7 +118,7 @@
       <div
         v-if="hasSelection"
         ref="footerRef"
-        class="flex gap-1 h-18 w-full items-center justify-between"
+        class="flex h-18 w-full items-center justify-between gap-1"
       >
         <div class="flex-1 pl-4">
           <div ref="selectionCountButtonRef" class="inline-flex w-48">
@@ -137,7 +137,7 @@
             </Button>
           </div>
         </div>
-        <div class="flex shrink gap-2 pr-4 items-center-safe justify-end-safe">
+        <div class="flex shrink items-center-safe justify-end-safe gap-2 pr-4">
           <template v-if="isCompact">
             <!-- Compact mode: Icon only -->
             <Button