This pull request refactors how compact notation is determined for axis tick labels in both theAxisX.svelte andAxisY.svelte components. The logic for deciding when to use compact notation (e.g., "1K" for 1,000) is now extracted into a derived store for clarity and consistency, and the code for formatting tick labels is updated to use this new logic.

Axis tick label formatting improvements:

• Extracted the logic for determining whether to use compact notation into a new$derived store calleduseCompactNotation in bothAxisX.svelte andAxisY.svelte, improving code readability and maintainability.[1][2]
• Updated the tick label formatting function to use the newuseCompactNotation store instead of recalculating the logic inline, ensuring consistent behavior and reducing code duplication.[1][2]