Fix handling of colors with alpha in color pickers and item tooltips

[AjaxGb]

Currently, color values with non-zero alpha are not handled correctly. If there is any alpha, the color picker will always be black. If the alpha is high enough to make the color value negative, tooltips also display incorrectly. (Many vanilla files contain 0xFF alpha, making the color value negative.)

This PR fixes both issues. For use with the color picker, alpha is truncated completely, since the HTML color picker doesn't support alpha, and Minecraft's dye system ignores it anyway. For display in the tooltip, negative integers are correctly converted to unsigned integers. Also capitalizes the hexadecimal in tooltips, to match the behavior in the game.

Example loot table:

{
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "minecraft:leather_helmet",
          "functions": [
            {
              "function": "minecraft:set_components",
              "components": {
                "minecraft:dyed_color": -16721153
              }
            }
          ]
        }
      ]
    },
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "minecraft:leather_boots",
          "functions": [
            {
              "function": "minecraft:set_components",
              "components": {
                "minecraft:dyed_color": 251714303
              }
            }
          ]
        }
      ]
    }
  ]
}

Helmet: 0xff alpha, resulting in negative color value. Tooltip contains a minus sign in a weird place, color picker is broken.

Boots: 0x0f alpha, resulting in positive color value. Tooltip is okay (although it should be uppercase to match the actual game), color picker is still broken.

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Name	Status	Preview	Updated (UTC)
misode	✅ Ready (Inspect)	Visit Preview	Feb 20, 2025 1:15am

[misode]

Is this correct? Does the game also show the alpha channel in hex here?

[AjaxGb]

Yes it does:

And it does not handle leading zeroes for it, which I also emulated (even though it looks stupid and is probably a bug):