KChart v1.18.1 - Categorical Axis Tick Density Fix

Fixed

• Fixed tickCount being ignored by point and string axes.
• Categorical axes now evenly sample displayed labels through explicit D3 tickValues.
• The first and last category labels are preserved while the complete scale domain and every series position remain unchanged.

Compatibility

• number and time axes retain their existing D3 tick hint behavior.
• Omitting tickCount or setting it to at least the category domain length continues to display every label.
• No migration is required.

Verification

• Added real D3 point, band, and time scale regression tests, including domain and pixel-position preservation and boundary values.