- Introduce --mr-z-context-menu-popup z-index variable and shift existing
z-indices up by one so context menu popups layer correctly above
other UI elements.
- Update resolver-main.css and resolver-shell.css context-menu rules to
use the new popup z-index with a fallback.
- Add joinLocalModelPath, buildLocalFolderContext, buildLocalModelContext,
and getLocalPathContextAttrs helpers to missing_browser_methods.js.
- Wire folder and model entries in the local browser to include encoded
JSON context attributes so right-click opens the model/folder context
menu with the correct open-folder and model actions.