colorify error when using oklch colors in color-mix() css functions

[nino-mau]

In a CSS file with the css_variables LSP active, oklch() colors used inside color-mix() functions cause the following error:

Error executing vim.schedule lua callback: ...local/share/nvchad/lazy/ui/lua/nvchad/colorify/utils.lua:31: Invalid highlight color: '#e7ffffffffffffffe80a'
stack traceback:
        [C]: in function 'nvim_set_hl'
        ...local/share/nvchad/lazy/ui/lua/nvchad/colorify/utils.lua:31: in function 'add_hl'
        ...cal/share/nvchad/lazy/ui/lua/nvchad/colorify/methods.lua:58: in function 'handler'
        /usr/share/nvim/runtime/lua/vim/lsp/client.lua:682: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

I can reproduce the error consistently with this snippet:

:root {
  --bg: oklch(1 0 0);
  --fg: oklch(0.577 0.245 27.325);
  --mixed: color-mix(in oklab, var(--fg) 10%, var(--bg));
}

The issue is with the way you build the hex string there

ui/lua/nvchad/colorify/methods.lua

Line 56 in cb75908

local hex = string.format("#%02x%02x%02x", r * a * 255, g * a * 255, b * a * 255)

This fix worked for me (I took what AI suggested might not be the best fix):

local function clamp(v) return math.max(0, math.min(255, math.floor(v + 0.5))) end
local hex = string.format("#%02x%02x%02x", clamp(r * a * 255), clamp(g * a * 255), clamp(b * a * 255))