fix various code completion crashes#2626

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Techatrix wants to merge 3 commits intomasterfrom

techatrix/fuzzer-fixes

Commits on Mar 1, 2026

fix import completions after unterminted string literal with newline
Techatrix
committed
fix completion when the cursor is positioned before a lone `@` character
Techatrix
committed
fix enum completion on out of bound token index
Techatrix
committed