Closes #594

Summary of Changes

• Updated TableMutationEngine.formatLiteral to accept an optional dataTypeName parameter and safely preserve text columns:
  • String columns (varchar, text, char, uuid, json, etc.) are always wrapped in single quotes, preserving values with leading zeros (e.g. 01234) and text booleans (e.g. true).
  • Added fallback heuristic so leading-zero numeric strings (^0\d+$) without explicit schema metadata are also quoted as strings.
• Added columnDataTypes map parameter to TableMutationEngine.generatePlan and DataGridStagingBuffer.generateMutationPlan.
• Added comprehensive unit tests in test/core/database/table_mutation_engine_test.dart.