fix: correct indentation of nested code blocks in wgslGenerator

[Copilot]

Nested block statements in TGSL functions were missing indentation prefix for the opening brace when generating WGSL output.

Before:

fn f() -> i32 {
  var res = 0;
{ 
    const f2 = 2;
    res += f2;
  }
  return res;
}

After:

fn f() -> i32 {
  var res = 0;
  {
    const f2 = 2;
    res += f2;
  }
  return res;
}

Changes

• Added this.ctx.pre prefix to standalone block statements in wgslGenerator.ts
• Added test case for nested block indentation
• Updated oklab.test.ts snapshot with corrected indentation

Original prompt

---

This section details on the original issue you should resolve

<issue_title>fix: incorrect indentation of nested code blocks</issue_title>
<issue_description>When resolving the following function

const f = () => {
  'use gpu';
  let res = 0;
  {
    const f = 2;
    res += f;
  }
  return res;
}

We get this output

fn f() -> i32 {
  var res = 0;
{ 
    const f2 = 2;
    res += f2;
  }
  return res;
}

The second opening brace is not indented correctly. It has too few leading spaces.</issue_description>

<agent_instructions>The root cause is likely located in wgslGenerator.ts within the logic responsible for handling NODE.Block. The indentation level is not being correctly propagated or incremented when entering a nested block.</agent_instructions>

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

• Fixes fix: incorrect indentation of nested code blocks #2024

---

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[iwoplaza]

Good job Copilot 🤖

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