fix(window): restore WindowChrome resize border thickness when restored from Maximized (closes #246)

[omid-io]

Summary

Fixes #246 (and upstream #1793) where an hc:Window initialized with WindowState="Maximized" could not be resized and lacked resize cursor affordances after being restored to Normal.

Root Cause

1. When WindowState == WindowState.Maximized at load time, OnLoaded sets chrome.ResizeBorderThickness = new Thickness(0) to prevent edge stretching while maximized.
2. When the window is subsequently restored (via window restore buttons, snap layouts, Win32 SC_RESTORE, or title-bar drag), OnStateChanged updated BorderThickness and NonClientAreaHeight, but never restored WindowChrome.ResizeBorderThickness.
3. Furthermore, OnPropertyChanged is not reliably called by WPF during Win32-initiated state changes (e.g., system commands or snap gestures), leaving ResizeBorderThickness stuck at 0.

Solution

1. In Window.cs, invoked ApplyWindowChrome(WindowState) inside OnStateChanged(EventArgs e) so that every transition back to WindowState.Normal dynamically re-applies the proper resize border thickness (6px) or clears it if Maximized / NoResize.
2. In Window!.cs, ensured ResizeMode == ResizeMode.NoResize is explicitly honored when calculating chrome.ResizeBorderThickness.

Verification

• Built HandyControl_Net_GE45.csproj targeting net8.0-windows cleanly with 0 compilation errors.

[ghost1372]

Thank you