fix(client): expand shorthand hex in hexToRgb instead of a NaN channel

[jeffrey701]

Problem

hexToRgb (client/src/components/animation/particleEffects.ts) reads fixed byte offsets off the hex string:

const h = hex.replace("#", "");
return { r: parseInt(h.substring(0,2),16), g: parseInt(h.substring(2,4),16), b: parseInt(h.substring(4,6),16) };

For a CSS-legal 3-digit shorthand like #fff, h is "fff", so the blue channel reads h.substring(4, 6) === "" -> parseInt("", 16) === NaN. The result is a corrupt rgb(r, g, NaN) color string, which renders nothing.

Fix

Expand 3-digit shorthand to its 6-digit form (#fff -> ffffff) before parsing.

Test

client/src/components/animation/__tests__/hexToRgb.test.ts — covers 6-digit parsing and asserts shorthand produces no NaN channel.

[gemini-code-assist]

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