fix: inconsistencies when analyzing unnamed closures

[EagleoutIce]

Furthermore, this

• improves mermaid's printing of expression lists when the lexeme is unknown.
• simplifies the flag for named and unnamed function calls as a boolean

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.55102% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 71.69%. Comparing base (43a4ef5) to head (dfa43d0).

Files	Patch %	Lines
src/util/mermaid/dfg.ts	60.00%	0 Missing and 4 partials :warning:
src/util/mermaid/ast.ts	33.33%	2 Missing :warning:
...ess/functions/call/built-in/built-in-assignment.ts	50.00%	0 Missing and 1 partial :warning:
src/reconstruct/reconstruct.ts	85.71%	0 Missing and 1 partial :warning:
src/slicing/criterion/filters/all-variables.ts	0.00%	0 Missing and 1 partial :warning:
...c/statistics/features/common-syntax-probability.ts	0.00%	0 Missing and 1 partial :warning:
...s/supported/defined-functions/defined-functions.ts	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #823 +/- ## ========================================== - Coverage 71.76% 71.69% -0.07% ========================================== Files 201 201 Lines 7239 7243 +4 Branches 1221 1122 -99 ========================================== - Hits 5195 5193 -2 - Misses 1689 1693 +4 - Partials 355 357 +2 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[EagleoutIce]

This pull request is included in v2.0.2 (see Release v2.0.2 (Fixing Control-Flow, Markdown-Exports, and Handling of Unnamed Closures)).