fix : correct RGB components in grayscale distance calculation in Color.ts

[tmdeveloper007]

Summary of What Has Been Done

Fixed a variable reuse bug in packages/core/src/style/Color.ts where the ANSI-256 grayscale distance calculation incorrectly used r_c for all three color channels (r, g, and b). Introduced r_gray, g_gray, and b_gray variables with the correct array offsets.

Changes Made

packages/core/src/style/Color.ts

• Replaced the single r_c = ANSI256_RGB[grayColor * 3] reuse with three separate variables: r_gray, g_gray, and b_gray with correct array offsets
• Fixed distGray calculation to use all three correct gray components

Impact it Made

Corrected ANSI-256 color conversion accuracy for grayscale colors. The closest grayscale is now selected based on proper Euclidean distance across all three RGB channels.

Closes #3230

Note: Please assign this PR to the tmdeveloper007 account.

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Reviewing files that changed from the base of the PR and between 48f63a1 and 52b9f3e.

📒 Files selected for processing (1)

• packages/core/src/style/Color.ts

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