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/rightSidePanel/RightSidePanel.vue

@@ -36,6 +36,7 @@ const canvasStore = useCanvasStore()
 const rightSidePanelStore = useRightSidePanelStore()
 const settingStore = useSettingStore()
 const { t } = useI18n()
+
 const { findParentGroup } = useGraphHierarchy()
 
 const { selectedItems: directlySelectedItems } = storeToRefs(canvasStore)

src/components/rightSidePanel/parameters/WidgetItem.vue

@@ -46,6 +46,7 @@ const emit = defineEmits<{
 }>()
 
 const { t } = useI18n()
+
 const canvasStore = useCanvasStore()
 const favoritedWidgetsStore = useFavoritedWidgetsStore()
 const isEditing = ref(false)