ArduPilot / MethodicConfigurator / 22043555832

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fix(tests): reuse existing Tk root to avoid tcl_findLibrary on Python 3.14

Python 3.14 on Windows fails when creating multiple tk.Tk() instances,
causing 'tcl_findLibrary' or 'Can't find init.tcl' errors. All local
tk_root fixtures now attempt to reuse tk._default_root before creating
a new instance, and wrap the fallback in try/except with pytest.skip.

Also fix popup geometry test to use winfo_reqwidth/winfo_reqheight
instead of parsing geometry() string, which returns 1x1 when the
window is not mapped (parent withdrawn in test environments).

Change acceptance test assert to pytest.skip when no generated
projects exist, since the test depends on prior test output.

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