[Enhancement] Align user profile and comparison modal chart colors with LeetCode difficulty scheme

[Yashaswini-K-P]

Description

Currently, the charts on the user profile and the comparison modal bar graphs use a color palette that differs slightly from leetcode color scheme.

To maintain visual consistency and a unified theme:

• Update the graph colors on the user profile graphs and the comparison modal bar graphs to exactly match the LeetCode difficulty color scheme already used in the main leaderboard.

I would like to work on this

[github-actions]

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[TanCodeX]

@jagdish-15 PLease assign me this under gssoc

[jagdish-15]

Please expand this to include the summary stats as well