* Execute batch structural upgrade of all XIB files within ./Tests/Manual to modern XML DOM format using ibtool (Xcode 26.3) to resolve imminent Xcode 27 parsing failures.
* Add regenerate-test-cibs.py script to recursively compile the modernized XIB documents into CIB artifacts within Tests/Manual/ using the local nib2cib toolchain.
* Commit the updated CIB artifacts to maintain CI and test execution parity.
*Include batch execution bash and Python scripts with LGPL-2 licensing to serve as reference migration templates for the community.
Without this feature windows could easily end up being placed outside of the screen/browser when loaded in Cappuccino due to e.g. the window position being 100 px from the bottom of a 1418 px tall screen but the browser only being 800 px.
This commit adds support for all "initial position" window masks in Interface Builder except "centre". Position can be specified in current screen space coordinates and then adjusted proportionally to the browser size, or adjusted while preserving a left or right margin and a top or bottom margin.