If settings.json in portable settings folder (or folder itself) is not writeable WT will crash if you try to save settings #18913
Description
Windows Terminal version
1.22.250314001 Portable (probably other versions as well)
Windows build number
10.0.26100.4061
Other Software
N\A
Steps to reproduce
Open settings UI, make a change click save > WT crashes
Expected Behavior
An error should be raised if settings.json is not writeable, but WT should not crash.
Actual Behavior
WT Crashes. If folder is writeable but not the settings.json file a settings.json.tmp is created
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