fix: align max click value with displayed formatted size (fixes #226)

[jiangyj545]

Summary

Fixes #226 — Close Position modal: clicking Max now populates the input with the formatted display value instead of the raw position size.

Problem

The "Max" label displays formatForDisplay(data.size) (e.g., 1,234.57 ETH), but on:click set amount = data.size (raw unformatted value like 1234.56789012). This caused a mismatch between what the user saw and what appeared in the input field.

Change

File: src/components/modals/ClosePosition.svelte (line 99)

```diff

• on:click={() => amount = data.size}

• on:click={() => amount = formatForDisplay(data.size)}
  ```

Verification

• `npx rollup -c` ✅ builds successfully
• Clicking Max now shows the same clean number in the input as displayed in the Max label