Align Boolean Variable Names with Dart Guidelines

[DCodeProg]

Summary

Refactor boolean variables and properties across the codebase to align with Dart naming recommendations by adding standard prefixes (e.g., is, has).

Details

Current implementation declares boolean variables using simple adjectives or nouns (e.g., bool empty, bool valid).
This naming convention is inconsistent with the Dart ecosystem and can lead to ambiguity regarding the variable's type or intent.

Proposal: Rename all boolean fields, parameters, and local variables to use is, has, or should prefixes.

// Current
bool empty = true;
bool error = false;

// Proposed
bool isEmpty = true;
bool hasError = false;

Additional Notes / References

• https://dart.dev/effective-dart/design#prefer-a-non-imperative-verb-phrase-for-a-boolean-property-or-variable

Pre‑Work Checklist

• No existing issue covers this work.