fix(web): storage row press tracking compiles under React Compiler

React Compiler does not support logical assignment operators, so the
`??=` in the row's pointerdown handler made it skip StorageSettings and
failed reactCompilerCoverage.test.ts in CI. Use an explicit null check
with the same semantics.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
d3910b9e17Julius Marminge committed on 10/22/2026, 9:34:29 PMparent140c502

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