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/components/common/SearchBox.vue

@@ -117,7 +117,7 @@ watchDebounced(
 const wrapperStyle = computed(() => {
   if (showBorder) {
     return cn(
-      'rounded p-2 border border-solid border-border-default box-border',
+      'rounded-sm p-2 border border-solid border-border-default box-border',
       isLarge.value ? 'h-10' : 'h-8'
     )
   }