Description of Change

This PR significantly improves the Dijkstra algorithm implementation in graph/dijkstra.go by addressing several critical issues found in the current implementation:

Problems Fixed:

• MaxHeap/MinHeap confusion with misleading comments
• Type safety issues with interface{} usage and unsafe casts
• Missing error handling and input validation
• Incomplete documentation and test coverage

Improvements Made:

• Proper min-heap implementation using container/heap
• Complete type safety with dedicated structs
• Robust error handling with comprehensive input validation
• Early termination optimization for better performance
• Full GoDoc documentation following project standards
• 100% backward compatibility maintained

New Features Added:

• DijkstraWithPath() - Returns complete shortest path reconstruction
• DijkstraAllPairs() - Computes distances to all reachable nodes
• Comprehensive test suite with edge cases, benchmarks, and stress tests

Performance & Quality:

• Maintains O((V+E) log V) time complexity
• Improved memory management and overflow protection
• Extensive test coverage including error conditions
• Full backward compatibility - existing code continues to work unchanged

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass
• Added documentation so that the program is self-explanatory and educational - GoDoc guidelines
• Relevant documentation/comments is changed or added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate
• I acknowledge that all my contributions will be made under the project's license

Notes: This improvement maintains 100% backward compatibility while fixing critical algorithmic and type safety issues. All existing code using Dijkstra() will continue to work unchanged, but with better performance and reliability.