fix: don't drop sentinel if ini write fails

If File.WriteAllText fails (e.g., storage not ready on first launch),
the sentinel was still being dropped, meaning the retry opportunity was
lost and the user could be stuck with Vulkan default permanently.

Now we return early on write failure, preserving the sentinel for retry
on the next launch.

Author: Ubuntu

graphify-out/cache/ast/00025279316c96aebaac54e70f4abd70014541cdeadd73b95bdcbabc338e1c57.json

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