Add ability to export multiple files from CLI arguments

[USSX-Hares]

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe.
Currently, if you need export files provided by mask (i.e., task1-*.drawio), you need to use ls <pattern> | xargs drawio <args> syntax, which isn't pretty and requires drawio app to load every time.

Describe the solution you'd like
Passing multiple arguments will reduce export time significantly as, for small documents, it is shorter than boot time.

Desireable CLI API:

Usage: drawio [options] [input file/folder]...

$ drawio --export task1-*.drawio
$ drawio --export file1.drawio file2.drawio file3.drawio

Passing multiple files should work similarly as passing directory name.

Describe alternatives you've considered
Alternatives considered:

1. ls | xargs (described above)
2. Passing directory as an argument -- renders all documents in the directory, including ones not needed to be updated
3. Makefile -- looks like an overkill

Additional context
Also, xargs not present on Windows.

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: The user requests the ability to pass multiple input files to the draw.io desktop CLI for batch export in a single invocation, avoiding the overhead of launching the application separately for each file (especially relevant on Windows where xargs is unavailable).

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📝 Additional Information Needed

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

• Could you clarify the desired CLI syntax? For example, would it be drawio --export task1-*.drawio (shell glob expansion) or something like drawio --export --pattern 'task1-*.drawio' (internal glob support)?
• Would you also want support for mixed export options per file, or would all files share the same export arguments?

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