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## Summary This PR refactors CmdPal settings/state to be immutable end-to-end. ### Core changes - Convert model types to immutable records / init-only properties: - `SettingsModel` - `AppStateModel` - `ProviderSettings` - `DockSettings` - `RecentCommandsManager` - supporting settings types (fallback/hotkey/alias/top-level hotkey/history items, etc.) - Replace mutable collections with immutable equivalents where appropriate: - `ImmutableDictionary<,>` - `ImmutableList<>` - Move mutation flow to atomic service updates: - `ISettingsService.UpdateSettings(Func<SettingsModel, SettingsModel>)` - `IAppStateService.UpdateState(Func<AppStateModel, AppStateModel>)` - Update ViewModels/managers/services to use copy-on-write (`with`) patterns instead of in-place mutation. - Update serialization context + tests for immutable model graph compatibility. ## Why Issue #46437 is caused by mutable shared state being updated from different execution paths/threads, leading to race-prone behavior during persistence/serialization. By making settings/app state immutable and using atomic swap/update patterns, we remove in-place mutation and eliminate this class of concurrency bug. ## Validation - Built successfully: - `Microsoft.CmdPal.UI.ViewModels` - `Microsoft.CmdPal.UI` - `Microsoft.CmdPal.UI.ViewModels.UnitTests` - Updated unit tests for immutable update patterns. Fixes #46437 --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>