Add Category column to Global Variables table

[Copilot]

Global variables lacked a visible Category column, forcing users to click into each variable to determine if it was a Terraform or Environment variable. Variable sets and workspace variables already displayed this information inline.

Changes:

• Added Category column to global variables table showing "terraform" or "env"
• Adjusted column widths: Key (30%), Value (30%), Category (15%), Actions (25%)
• Implemented sorting on Category column using displayed values

Implementation:

{
  title: "Category",
  dataIndex: "category",
  key: "category",
  width: "15%",
  sorter: (a: Variable, b: Variable) => {
    const categoryA = a.attributes.category === "TERRAFORM" ? "terraform" : "env";
    const categoryB = b.attributes.category === "TERRAFORM" ? "terraform" : "env";
    return categoryA.localeCompare(categoryB);
  },
  render: (_: any, record: Variable) => {
    return record.attributes.category === "TERRAFORM" ? "terraform" : "env";
  },
}

Display format matches workspace variables (Variables.tsx) and variable collections (CreateEditCollection.tsx) for consistency.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Global variables display differs from variables sets. You can't see type or description without clicking into them.</issue_title> <issue_description>### Bug description 🐞

Not a bug, but global vars should share the same style of UI as variable sets and workspace variables.

Steps to reproduce

Open global variables. Tell me what's a env and whats a tf var without clicking into it.

Expected behavior

Variable type should display just like it does for other variable UI in the app.

Example repository

No response

Anything else?

No response</issue_description>

<agent_instructions>Use the same UI style for global variables</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes terrakube-io/terrakube#2788

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