fix: enable enforce-canonical-classes tailwind lint rule (#9427)

## Summary

Enable `better-tailwindcss/enforce-canonical-classes` lint rule and
auto-fix all 611 violations across 173 files. Stacked on #9417.

## Changes

- **What**: Simplify Tailwind classes to canonical forms via `eslint
--fix`:
  - `h-X w-X` → `size-X`
  - `overflow-x-hidden overflow-y-hidden` → `overflow-hidden`
  - and other canonical simplifications
- Enable `enforce-canonical-classes` as `'error'` in eslint config

## Review Focus

Mechanical auto-fix PR — all changes produced by `eslint --fix`. No
visual or behavioral changes; canonical forms are functionally
identical.

**Stack:** #9417 → **this PR** → PR 3 (class order)

Fixes #9300 (partial — 2 of 3 rules)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9427-fix-enable-enforce-canonical-classes-tailwind-lint-rule-31a6d73d365081a49340d7d4640ede45)
by [Unito](https://www.unito.io)

src/components/ui/select/SelectItem.vue

@@ -21,7 +21,7 @@ const { class: className, ...restProps } = defineProps<
         'focus:bg-secondary-background-hover',
         'data-[state=checked]:bg-secondary-background-selected',
         'data-[state=checked]:hover:bg-secondary-background-selected',
-        'data-[disabled]:pointer-events-none data-[disabled]:opacity-50',
+        'data-disabled:pointer-events-none data-disabled:opacity-50',
         className
       )
     "

src/components/ui/select/SelectTrigger.vue

@@ -21,7 +21,7 @@ const { class: className, ...restProps } = defineProps<
         'border-[2.5px] border-solid border-transparent',
         'transition-all duration-200 ease-in-out',
         'focus:border-node-component-border focus:outline-none',
-        'data-[placeholder]:text-muted-foreground',
+        'data-placeholder:text-muted-foreground',
         'disabled:cursor-not-allowed disabled:opacity-60',
         '[&>span]:truncate',
         className