Fix zoom reset issue when flowchart is too wide and not tall enough

[rashidakanchwala]

Description:

In both horizontal and vertical orientations, when the flowchart becomes too wide and not tall enough, resetting the zoom does not always fully zoom out to fit the entire flowchart within the view. As a result, parts of the flowchart, especially on the left, may still be cut off.

We need to adjust the zoom reset logic to take into account extreme aspect ratios (very wide but shallow in height).Ensure the entire flowchart is always within view when reset is clicked.

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