* Refactor KioskModeManager component and introduce WakeUp-Events incl.. new WakeUpEventArgs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 20883488-cf1e-4ad3-a681-0724e9f16777

Size borderless fullscreen forms directly to the selected screen bounds instead of maximizing them. This keeps StatusStrip items and working-area-constrained dropdowns on the same screen edge while preserving restored form state.

Fixes dotnet#14765

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: c352332b-4b81-4492-bcfc-9dec524c27c9

Choose fullscreen bounds from RestoreBounds for minimized and maximized forms so a minimized-window sentinel cannot redirect kiosk mode to the wrong monitor.

Fixes dotnet#14765

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: c352332b-4b81-4492-bcfc-9dec524c27c9

Reapply explicit fullscreen bounds when display geometry or the taskbar working area changes so the normal-state kiosk window tracks the selected screen like the previous maximized window did.

Fixes dotnet#14765

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: c352332b-4b81-4492-bcfc-9dec524c27c9

API review feedback: the "Wakeup" elements are more general than kiosk mode
and should not be part of KioskModeManager. They can reappear later with a
broader scope.

Removes the Wakeup event, OnWakeup, WakeUpCommand, KioskModeWakeupEventArgs,
KioskModeWakeupEventHandler, and KioskModeWakeupSource, along with the power
broadcast and terminal session notification plumbing that only fed them.
Display change tracking, which keeps the fullscreen bounds current, is kept.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8999e9ff-9bcc-4755-b337-7fc5496d431c

API review feedback: HideTaskbar was removed to simplify the window models.

Kiosk fullscreen now always sizes the borderless form to the complete bounds
of the screen that displays it, so there is a single window model and the
kiosk surface always covers the taskbar.

Because the fullscreen form now covers the taskbar, drop-downs owned by that
form can no longer be constrained to the screen working area - doing so
detaches them from the item that opened them (dotnet#14765).
ToolStripDropDown and ToolStripDropDownItem now constrain to the complete
screen bounds when the owning top-level window is borderless and covers the
screen.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8999e9ff-9bcc-4755-b337-7fc5496d431c

- ToggleFullScreenKey => ToggleFullScreenKeys, for consistency with the
  plurality of the Keys type. The property now matches the complete key
  combination, including modifiers, and Keys.None disables key based
  toggling.
- SuppressPowerSaving => AlwaysOn.

Also documents that the fullscreen keys are focus driven: they are evaluated
only for input dispatched to the managed form or one of its child controls,
and no global keyboard hook or system wide hot key is installed.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8999e9ff-9bcc-4755-b337-7fc5496d431c