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/workbench/extensions/manager/stores/comfyManagerStore.ts

@@ -2,8 +2,8 @@ import { useEventListener, whenever } from '@vueuse/core'
 import { defineStore } from 'pinia'
 import { v4 as uuidv4 } from 'uuid'
 import { ref, watch } from 'vue'
-import { useI18n } from 'vue-i18n'
 
+import { t } from '@/i18n'
 import { useCachedRequest } from '@/composables/useCachedRequest'
 import { useServerLogs } from '@/composables/useServerLogs'
 import { api } from '@/scripts/api'
@@ -30,7 +30,6 @@ type UpdateAllPacksParams = components['schemas']['UpdateAllPacksParams']
  * Store for state of installed node packs
  */
 export const useComfyManagerStore = defineStore('comfyManager', () => {
-  const { t } = useI18n()
   const managerService = useComfyManagerService()
 
   const installedPacks = ref<InstalledPacksResponse>({})