[shobhit-seg]

Summary

• add independent persisted sort preferences for native Pages and Google Drive
• keep Modified / newest first as the default and add Alphabetical / A-Z
• apply the Pages preference to native trees, child lists, and standard content views
• apply the Drive preference to the sidebar, browser, and search results
• add shared regression coverage for both sort modes

Validation

• shared tests: 22 passed
• web tests: 16 passed
• shared and web typechecks passed
• Biome checks passed
• browser verification passed for default ordering, live switching, synchronized controls, and reload persistence
• browser harness used an empty env directory and mock API; no project environment file was read