PinnedNavBarState now takes WorkspaceManager reference. Pin/unpin
actions update the active workspace's singlePaneScreens list,
making sidebar customization and workspace editing the same action.
- PinnedNavBarState.syncToWorkspace() updates active workspace on pin/unpin
- PinnedNavBarState.loadFromWorkspace() loads from active workspace
- Remove separate DesktopPreferences.pinnedNavItems persistence
- Workspace is the single source of truth for nav bar screens
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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