feat(assets): add ModelInfoPanel for asset browser right panel (#8090)

## Summary

Adds an editable Model Info Panel to show and modify asset details in
the asset browser.

## Changes

- Add `ModelInfoPanel` component with editable display name,
description, model type, base models, and tags
- Add `updateAssetMetadata` action in `assetsStore` with optimistic
cache updates
- Add shadcn-vue `Select` components with design system styling
- Add utility functions in `assetMetadataUtils` for extracting model
metadata
- Convert `BaseModalLayout` right panel state to `defineModel` pattern
- Add slide-in animation and collapse button for right panel
- Add `class` prop to `PropertiesAccordionItem` for custom styling
- Fix keyboard handling: Escape in TagsInput/TextArea doesn't close
parent modal

## Testing

- Unit tests for `ModelInfoPanel` component
- Unit tests for `assetMetadataUtils` functions

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>

docs/testing/vitest-patterns.md

@@ -30,6 +30,10 @@ describe('MyStore', () => {
 
 **Why `stubActions: false`?** By default, testing pinia stubs all actions. Set to `false` when testing actual store behavior.
 
+## i18n in Component Tests
+
+Use real `createI18n` with empty messages instead of mocking `vue-i18n`. See `SearchBox.test.ts` for example.
+
 ## Mock Patterns
 
 ### Reset all mocks at once