chore: add missing i18n keys in sidebar, assets, toolbox, dropdowns (#6622)

This PR 

- adds missing locale keys for 3D viewer toast strings, assets sidebar
labels, and node error keys
- cleans up the selection toolbox, media previews, node components, and
widget uploader to rely on `$t`/`st` (exposed to template scope at
compile time) instead of importing from `useI18n`.
- updates `eslint.config.ts` to teach the Intlify rule about the locale
layout

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6622-chore-add-missing-i18n-keys-in-sidebar-assets-toolbox-dropdowns-2a36d73d365081ae8694eb4f8ebb822a)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>

apps/desktop-ui/src/views/MetricsConsentView.vue

@@ -71,8 +71,8 @@ const updateConsent = async () => {
   } catch (error) {
     toast.add({
       severity: 'error',
-      summary: t('install.errorUpdatingConsent'),
-      detail: t('install.errorUpdatingConsentDetail'),
+      summary: t('install.settings.errorUpdatingConsent'),
+      detail: t('install.settings.errorUpdatingConsentDetail'),
       life: 3000
     })
   } finally {