test(company-input-v2): pull api callback from mock call args to avoid CI race

[gcutrini]

Same test-stability fix that was applied to the v5 port (PR #250). The original auto-replaces a free-text commit… test from #246 captures the API callback via a closure variable that gets set inside the mock implementation; the closure is read on the next line, which races against React's effect commit timing. Passes locally, can flake in CI under different timing.

Pulling the callback directly from mock.calls[last][2] makes the test deterministic.

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[gcutrini]

Closing as out-of-scope. The flaky-closure pattern in this v4 test is real but not what Sebastian flagged; we can revisit if it actually flakes in CI.