Hidden “More Features” page, adaptive theme sync, time-period rule, and related fixes

[Programmer-MrWang]

Motivation

• Expose extra plugin functionality behind a hidden settings page and provide an entry from the main settings without showing it in the sidebar.
• Improve UX/safety for several features: make the local quote carousel accept a much larger interval, ensure temporary-class-plan actions can be reverted to the original state, and make timed shutdown stop when the host exits.
• Provide an opt-in automatic theme sync that matches ClassIsland main-window background luminance to app theme.
• Add a simple time-period rule for automation that supports cross-day ranges.

Description

• LocalQuote component: increased UI NumericUpDown maximum to 8000 and added runtime clamping with Math.Clamp(Settings.CarouselIntervalSeconds, 1, 8000) in RefreshTimerInterval to enforce range 1..8000 seconds (Controls/Components/LocalQuoteSettingsControl.axaml, LocalQuoteComponent.axaml.cs).
• LoadTemporaryClassPlanAction: snapshot the prior TempClassPlanId/TempClassPlanSetupTime when invoked (when revertible) and restore that snapshot in OnRevert (or clear if no snapshot) using a ConcurrentDictionary keyed by ActionSet.Guid (Actions/LoadTemporaryClassPlanAction.cs).
• Hidden settings page: added MoreFeaturesOptionsSettingsPage (XAML + code-behind) and registered it with HideDefault=true, added a Button on the main plugin SystemTools settings to navigate to the hidden page using a classisland://app/settings/...?ci_keepHistory=true URI (SettingsPage/MoreFeaturesOptionsSettingsPage.*, SettingsPage/SystemToolsSettingsPage.axaml(.cs), registration in Plugin.cs).
• Adaptive theme sync: added AdaptiveThemeSyncService that samples the ClassIsland main-window area every 2s, computes luminance from a few sample pixels and calls IThemeService.SetTheme(...) to switch between Light/Dark; added AutoMatchMainBackgroundTheme config flag in MainConfigData, registered the service as singleton and start/stop hooks in plugin lifecycle (Services/AdaptiveThemeSyncService.cs, ConfigHandlers/MainConfigData.cs, Plugin.cs).
• Advanced shutdown: ensure planned shutdown is fully cancelled when stopping plugin or when stopping internal states by killing the internal countdown process and attempting shutdown /a as a fallback; added CancelPlanOnAppStopping call during plugin shutdown and call to TryAbortSystemShutdown() when stopping states (Actions/AdvancedShutdownAction.cs, Plugin.cs).
• New rule: InTimePeriodRule with InTimePeriodRuleSettings and InTimePeriodRuleSettingsControl, supporting start/end input and cross-day intervals (e.g. 22:00 - 06:00); handler HandleInTimePeriodRule added and rule registered in Plugin.cs, and added to feature list in settings view model (Rules/InTimePeriodRuleSettings.cs, Controls/InTimePeriodRuleSettingsControl.cs, Plugin.cs, SettingsPage/SystemToolsSettingsViewModel.cs).

Testing

• Attempted to run an automated build with dotnet build -v minimal in the execution environment but dotnet is not available (/bin/bash: dotnet: command not found), so no successful compilation was performed.
• No other automated tests were executed in this environment. Please run a full local build (dotnet build) and smoke-test the plugin inside ClassIsland to verify behavior (start/stop lifecycle, navigation to the hidden settings page, toggle AutoMatchMainBackgroundTheme, trigger LoadTemporaryClassPlan with revertable automation, and test advanced shutdown cancellation).

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[chatgpt-codex-connector]

Avoid aborting unrelated system shutdowns

StopAllStates now always calls shutdown /a, which cancels any pending Windows shutdown globally, not just one started by this action. That means stopping this action (or app shutdown via CancelPlanOnAppStopping) can unexpectedly cancel a shutdown scheduled by another tool/admin process, which is a functional regression outside this feature's scope.

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[chatgpt-codex-connector]

Reapply theme after re-enabling auto-sync

The early-return on targetTheme == _lastAppliedTheme assumes the app theme still matches the last auto-applied value. If users disable auto-sync, manually switch theme, then re-enable it, RefreshNow can skip SetTheme entirely because _lastAppliedTheme is stale, leaving the theme mismatched to the detected background until a later luminance change.

Useful? React with 👍 / 👎.