chore(chat): log where touches on the attach card go

[bmc08gt]

A TestFlight user's inline photo picker draws but won't scroll or select. The card's own back and All Photos buttons still work, and a force quit doesn't clear it. It doesn't reproduce on the simulator in either keyboard mode, so this logs which layer takes or drops the touch.

• BarClipView logs each touch above the bar with the band's top (touchTop) and the view that took it. The screen logs every change to the overflow state, with the bar's frame and whether its window is the key window.
• The bar logs cardTop each time the card is laid out, against the key window it's measured in.
• AttachOverlayContainer logs each touch with the panel and card regions, the view that took it, and its window.

What it can and can't see:

• Keyboard down: grid touches go through BarClipView, so a dead grid shows up as Bar overflow touch with hit=none or an unexpected view.
• Keyboard up: the system hands grid touches straight to the picker and the app never hit-tests them. With the guard removed, every hit test in AttachOverlayContainer logged except the grid taps, which still selected photos. Only the card's controls show up there, so a dead grid logs nothing. The existing Attach panel opening mode= line still shows which mode the user was in.

SensitiveKeyRedactor blanks any metadata key containing "key", which hid the overlay's existing keyboardHeight and keyboardWindowFound. They're now overlapHeight and inputWindowFound.