Finish automaton UI integrations

[ThalesMMS]

Summary

• enable regex and grammar conversions to navigate with produced artifacts from the automaton provider
• surface DFA equivalence workflow, including file import handling and status messaging in the algorithm panel and FSA page
• rework simulation panel step-by-step playback to use real simulator output and provide contextual descriptions
• highlight nondeterministic and epsilon transitions/states directly in the automaton canvas painter

Testing

• Not run (Flutter/Dart SDK not available in container)

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https://chatgpt.com/codex/tasks/task_e_68cc42e8c5d0832ea97f20e41ecec382

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