fix: resolve i18n no-restricted-imports lint warnings (#8704)

## Summary

Fix all i18n `no-restricted-imports` lint warnings and upgrade rules
from `warn` to `error`.

## Changes

- **What**: Migrate Vue components from `import { t/d } from '@/i18n'`
to `const { t } = useI18n()`. Migrate non-component `.ts` files from
`useI18n()` to `import { t/d } from '@/i18n'`. Allow `st` import from
`@/i18n` in Vue components (it wraps `te`/`t` for safe fallback
translation). Remove `@deprecated` tag from `i18n.ts` global exports
(still used by `st` and non-component code). Upgrade both lint rules
from `warn` to `error`.

## Review Focus

- The `st` helper is intentionally excluded from the Vue component
restriction since it provides safe fallback translation needed for
custom node definitions.

Fixes #8701

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8704-fix-resolve-i18n-no-restricted-imports-lint-warnings-2ff6d73d365081ae84d8eb0dfef24323)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>

src/components/maskeditor/dialog/TopBarHeader.vue

@@ -128,15 +128,16 @@
 
 <script setup lang="ts">
 import { ref } from 'vue'
+import { useI18n } from 'vue-i18n'
 
 import Button from '@/components/ui/button/Button.vue'
 import { useCanvasTools } from '@/composables/maskeditor/useCanvasTools'
 import { useCanvasTransform } from '@/composables/maskeditor/useCanvasTransform'
 import { useMaskEditorSaver } from '@/composables/maskeditor/useMaskEditorSaver'
-import { t } from '@/i18n'
 import { useDialogStore } from '@/stores/dialogStore'
 import { useMaskEditorStore } from '@/stores/maskEditorStore'
 
+const { t } = useI18n()
 const store = useMaskEditorStore()
 const dialogStore = useDialogStore()
 const canvasTools = useCanvasTools()