[Bug]: Fix issues identified during evaluation of data frame access validation

[OliverGerstl]

What happened?

• State domain is not over-approximated to Top when processing functions with unknown side effects (e.g. ecal or load)
• Columns created by summarize and accessed in other arguments of summarize are wrongly mapped as accessed columns (e.g. in summarize(df, n = n(), mean = score / n))
• Data frames appended to an empty data frame via rbind should append the columns of the second data frame (e.g. rbind(data.frame(), df))

What version of R do you have installed?

No response

What version of flowR did you use?

v2.6.1 (Oct 21, 2025)

Relevant log output

Meta Information

• The issue is urgent
• I used flowR as a docker image