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/sidebar/ModeToggle.vue

@@ -1,12 +1,13 @@
 <script setup lang="ts">
 import { computed } from 'vue'
+import { useI18n } from 'vue-i18n'
 
 import Button from '@/components/ui/button/Button.vue'
-import { t } from '@/i18n'
 import { useKeybindingStore } from '@/platform/keybindings/keybindingStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useCommandStore } from '@/stores/commandStore'
 
+const { t } = useI18n()
 const canvasStore = useCanvasStore()
 const keybindingStore = useKeybindingStore()
 

src/components/sidebar/SideToolbar.vue

@@ -58,6 +58,7 @@
 import { useResizeObserver } from '@vueuse/core'
 import { debounce } from 'es-toolkit/compat'
 import { computed, nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import { useI18n } from 'vue-i18n'
 
 import HelpCenterPopups from '@/components/helpcenter/HelpCenterPopups.vue'
 import ComfyMenuButton from '@/components/sidebar/ComfyMenuButton.vue'
@@ -66,7 +67,6 @@ import SidebarBottomPanelToggleButton from '@/components/sidebar/SidebarBottomPa
 import SidebarSettingsButton from '@/components/sidebar/SidebarSettingsButton.vue'
 import SidebarShortcutsToggleButton from '@/components/sidebar/SidebarShortcutsToggleButton.vue'
 import { useFeatureFlags } from '@/composables/useFeatureFlags'
-import { t } from '@/i18n'
 import { isCloud } from '@/platform/distribution/types'
 import { useSettingStore } from '@/platform/settings/settingStore'
 import { useTelemetry } from '@/platform/telemetry'
@@ -84,6 +84,7 @@ import SidebarIcon from './SidebarIcon.vue'
 import SidebarLogoutIcon from './SidebarLogoutIcon.vue'
 import SidebarTemplatesButton from './SidebarTemplatesButton.vue'
 
+const { t } = useI18n()
 const workspaceStore = useWorkspaceStore()
 const settingStore = useSettingStore()
 const userStore = useUserStore()