The `--page-index` option does not work correctly in the latest version.

[AinzRimuru]

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Describe the bug
Regardless of the value specified for --page-index, it always returns the first page.

To Reproduce
Steps to reproduce the behavior:
drawio.exe --export --format pdf --crop --page-index 2 --output *.pdf *.drawio

Expected behavior
Output the page specified by page-index.

Screenshots
None

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version 29.3.0

Desktop (please complete the following information):

• OS: Linux docker debian:bookworm-slim

Additional context
Downgrading the deb package version from 29.3.0 to 24.6.4 restored normal operation, but there wasn't enough time to investigate which version the problem originated in.

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: The --page-index command-line option in draw.io 29.3.0 is not working correctly and always exports the first page regardless of the specified page index value, which worked properly in version 24.6.4.

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📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• actual_behavior: While the user mentions it always returns the first page, it would be helpful to confirm this with specific output examples
• version_regression_range: User knows it worked in 24.6.4 and fails in 29.3.0 but hasn't identified which version introduced the regression

We also have some questions:

• Can you confirm that the command consistently outputs page 1 regardless of the --page-index value specified (e.g., does --page-index 3 also output page 1)?
• Are you able to test intermediate versions between 24.6.4 and 29.3.0 to help narrow down when this regression was introduced?
• Does this issue occur with other export formats (PNG, SVG) or only with PDF exports?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

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