refactor: use if-scoped err for the openBrowser call

[jabawack81]

Folds the final openBrowser call into an if-scoped error check:

if err := openBrowser(newPRURL); err != nil {
    log.Fatalf("Failed to open browser: %v", err)
}

openBrowser returns only an error (no value needed afterward), so scoping err to the if block is safe and idiomatic — it shrinks the variable's lifetime to exactly where it's used. The other error checks in main() keep := at function scope because they bind a value (remote, headRef, …) that later lines depend on.

Pure refactor, zero behaviour change. Verified: gofmt clean, go vet, go test all pass.

Second of the r/golang cleanup items.

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• main.go

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