feat: add tray floating-window toggle and local quote playback order

[Programmer-MrWang]

Motivation

• Provide a tray-menu toggle for the floating window so users can 显示/隐藏悬浮窗 from the system tray and keep that control synchronized with the main settings page.
• Follow the pattern used by DutyIsland (manipulating ITaskBarIconService.MoreOptionsMenuItems) to register/unregister tray items only when the floating-window feature is enabled.
• Extend the "本地一言" component with a user-selectable playback order so text lines can be played sequentially (existing behavior) or randomly.

Description

• Add tray integration in Plugin.cs: implement RegisterOrUpdateFloatingWindowTrayMenu, UnregisterFloatingWindowTrayMenu, OnMainConfigDataPropertyChanged, and UpdateFloatingWindowTrayMenuHeader, and call registration on startup and unregistration on stop; the tray item toggles MainConfigData.ShowFloatingWindow, calls FloatingWindowService.UpdateWindowState(), and persists the config.
• Add LocalQuotePlaybackOrder enum and PlaybackOrder observable property in Models/ComponentSettings/LocalQuoteSettings.cs with default Sequential.
• Update settings UI and control: add a 轮播顺序 settings expander (icon E143) and a ComboBox bound to the new enum in Controls/Components/LocalQuoteSettingsControl.axaml and expose PlaybackOrders in the control code-behind.
• Update LocalQuoteComponent runtime logic to support random playback by adding a Random instance, responding to PlaybackOrder changes, and choosing a random index when PlaybackOrder == LocalQuotePlaybackOrder.Random while preserving existing sequential behavior and persistence semantics.

Testing

• Attempted an automated build with dotnet build -v minimal, but the execution environment does not have dotnet installed so the build could not be performed (failed).
• No other automated test suites were executed in this environment; changes were staged and committed locally (git commit succeeded).

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Retry tray menu registration when service is temporarily null

RegisterOrUpdateFloatingWindowTrayMenu exits immediately when IAppHost.TryGetService<ITaskBarIconService>() returns null, but this method is only invoked at startup and on floating-window config changes. In startup orders where the tray service is not ready yet, the menu item is never added for the entire session unless the user later toggles ShowFloatingWindow/EnableFloatingWindowFeature, so the new tray toggle silently disappears for affected users.

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