fix: enable no-deprecated-classes tailwind lint rule (#9417)

## Summary

Enable `better-tailwindcss/no-deprecated-classes` lint rule and auto-fix
all 103 violations across 65 files. First PR in a stacked series for
#9300.

## Changes

- **What**: Replace deprecated Tailwind v3 classes with v4 equivalents:
  - `rounded` → `rounded-sm` (85)
  - `flex-shrink-0` → `shrink-0` (16)
  - `flex-grow` → `grow` (2)
- Enable `no-deprecated-classes` as `'error'` in eslint config
- Update one test asserting on `'rounded'` class string

## Review Focus

Mechanical auto-fix PR — all changes produced by `eslint --fix`. No
visual or behavioral changes (Tailwind v4 aliases these classes
identically).

Fixes #9300 (partial — 1 of 3 rules)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9417-fix-enable-no-deprecated-classes-tailwind-lint-rule-31a6d73d3650819eaef4cf8ad84fb186)
by [Unito](https://www.unito.io)

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/platform/cloud/onboarding/CloudAuthTimeoutView.vue

@@ -9,7 +9,7 @@
       </p>
 
       <!-- Troubleshooting Section -->
-      <div class="mb-4 rounded bg-secondary-background px-3 py-2 text-left">
+      <div class="mb-4 rounded-sm bg-secondary-background px-3 py-2 text-left">
         <h3 class="mb-2 text-sm font-semibold text-text-primary">
           {{ $t('cloudOnboarding.authTimeout.troubleshooting') }}
         </h3>
@@ -28,7 +28,7 @@
       <!-- Technical Details (Collapsible) -->
       <div v-if="errorMessage" class="mb-4 text-left">
         <button
-          class="flex w-full items-center justify-between rounded bg-secondary-background px-4 py-2 text-sm text-text-secondary transition-colors hover:bg-secondary-background-hover border-0"
+          class="flex w-full items-center justify-between rounded-sm bg-secondary-background px-4 py-2 text-sm text-text-secondary transition-colors hover:bg-secondary-background-hover border-0"
           @click="showTechnicalDetails = !showTechnicalDetails"
         >
           <span>{{ $t('cloudOnboarding.authTimeout.technicalDetails') }}</span>
@@ -41,7 +41,7 @@
         </button>
         <div
           v-if="showTechnicalDetails"
-          class="mt-2 rounded border-muted-background border p-4 font-mono text-xs text-muted-foreground break-all"
+          class="mt-2 rounded-sm border-muted-background border p-4 font-mono text-xs text-muted-foreground break-all"
         >
           {{ errorMessage }}
         </div>