Enable Canvas Drag & Select Modes #744

[ananyapandey9895]

This PR implements cursor-based canvas dragging functionality with support for two distinct interaction modes:

Select Mode:
The canvas remains static, allowing users to interact with and select individual elements without any unintended movement.
Drag Mode:
The entire canvas can be smoothly dragged and repositioned using the cursor, providing better navigation for large diagrams.

This update improves the overall usability and user experience by clearly separating interaction and navigation behaviors. The implementation ensures smooth mode switching, accurate cursor tracking, and prevents conflicts between dragging and element selection.

I worked on issue #744
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