[Windows 11] Minimize/restore breaks widget interactivity; dropdown rapid-click causes multi-second lag

[qq1792569310]

Steps to Reproduce

Issue 1:

Run examples
Minimize the window to the taskbar
Restore the window
Click any button

Issue 2:

Run examples/gallery
Scroll to the Inputs section (or use the theme picker in the toolbar)
Rapidly click the dropdown menu to expand/collapse it repeatedly
Observe that after 5-6 rapid clicks, the UI becomes significantly delayed (clicks may trigger seconds later)

Actual Behavior

Issue 1: After restoring from minimize, the error desktop: canvas.Render: gogpu: surface frame not available is printed, and all buttons become unresponsive. Every button click repeats this error.
Issue 2: Dropdown menu expand/collapse is laggy. After rapid clicking (~5-6 times), the UI experiences multi-second delays — a click may only take effect after 3-5 seconds.

Expected Behavior

Issue 1: Buttons should remain functional after minimize/restore.
Issue 2: Dropdown expand/collapse should respond instantly, and rapid clicking should not cause cumulative delays.

[kolkov]

Two separate issues here. The minimize/restore surface frame error is a window lifecycle issue in gogpu (the surface isn't re-acquired after restore). The dropdown rapid-click lag may be related to overlay Mount/Unmount leaks (#171) — each open/close could accumulate stale bindings. We'll investigate after the lifecycle sweep (#171-#175) and transfer the surface frame issue to gogpu.