Add errors for install dir edge cases (#6733)

## Summary
- show explicit validation errors when the install path lives inside the
desktop app bundle or updater cache
- include the new locale strings for these error prompts so the UI
surfaces actionable guidance

## Testing
- pnpm typecheck
- pnpm lint:fix

## Notes
Desktop types still need to be updated to include the new validation
flags; see https://github.com/Comfy-Org/desktop/pull/1400

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6733-Add-errors-for-install-dir-edge-cases-2af6d73d3650811bada6fc7dd72ecf68)
by [Unito](https://www.unito.io)

apps/desktop-ui/package.json

@@ -91,7 +91,7 @@
     "build-storybook": "storybook build -o dist/storybook"
   },
   "dependencies": {
-    "@comfyorg/comfyui-electron-types": "0.4.73-0",
+    "@comfyorg/comfyui-electron-types": "catalog:",
     "@comfyorg/shared-frontend-utils": "workspace:*",
     "@primevue/core": "catalog:",
     "@primevue/themes": "catalog:",

apps/desktop-ui/src/components/install/InstallLocationPicker.vue

@@ -115,19 +115,18 @@ import Button from 'primevue/button'
 import Divider from 'primevue/divider'
 import InputText from 'primevue/inputtext'
 import Message from 'primevue/message'
-import { type ModelRef, computed, onMounted, ref } from 'vue'
+import { computed, onMounted, ref } from 'vue'
+import type { ModelRef } from 'vue'
 import { useI18n } from 'vue-i18n'
 
-import MigrationPicker from '@/components/install/MigrationPicker.vue'
-import MirrorItem from '@/components/install/mirror/MirrorItem.vue'
-import {
-  PYPI_MIRROR,
-  PYTHON_MIRROR,
-  type UVMirror
-} from '@/constants/uvMirrors'
+import { PYPI_MIRROR, PYTHON_MIRROR } from '@/constants/uvMirrors'
+import type { UVMirror } from '@/constants/uvMirrors'
 import { electronAPI } from '@/utils/envUtil'
 import { ValidationState } from '@/utils/validationUtil'
 
+import MigrationPicker from './MigrationPicker.vue'
+import MirrorItem from './mirror/MirrorItem.vue'
+
 const { t } = useI18n()
 
 const installPath = defineModel<string>('installPath', { required: true })
@@ -229,6 +228,10 @@ const validatePath = async (path: string | undefined) => {
       }
       if (validation.parentMissing) errors.push(t('install.parentMissing'))
       if (validation.isOneDrive) errors.push(t('install.isOneDrive'))
+      if (validation.isInsideAppInstallDir)
+        errors.push(t('install.insideAppInstallDir'))
+      if (validation.isInsideUpdaterCache)
+        errors.push(t('install.insideUpdaterCache'))
 
       if (validation.error)
         errors.push(`${t('install.unhandledError')}: ${validation.error}`)