Deep copy an associative array (for state tracking)

Delete all settings for a library from registry

Disable automatic syncing (settings reset uses this around its bulk rewrite) Safe to call more than once.

Enable automatic syncing of settings changes to registry Call this AFTER loading initial settings from registry/server Safe to call more than once.

Called when displaySettings field changes Only syncs the specific settings that changed, not the entire object

Called when any individual setting field changes Observer is the single source of truth for registry sync IMPORTANT: Only syncs to registry - does not modify the node (prevents recursion)

DESIGN: Always save settings to registry, never delete This preserves user intent - if user explicitly sets a value to match the default, that's different from "never touched this setting". This is important for:

• Future multi-device sync
• Understanding what users have customized
• "Reset all settings" feature can delete entire registry section

Sync only changed settings for a library

Sync only the display settings that changed

Sync all settings for a library (new library case)