fix(cli): validate --exclude regex pattern before use

[evanofficial]

Summary

Invalid regex patterns passed to --exclude caused an unhandled PatternSyntaxException with a raw stack trace. Now the pattern is validated early using Clikt's validate {} block, displaying a clear error message instead.

Before:

Exception in thread "main" java.util.regex.PatternSyntaxException: ...
    at java.util.regex.Pattern.error(...)
    ...

After:

Error: Invalid regex pattern for --exclude: "[invalid(regex". Unclosed character class near index 14

Changes

• Main.kt — Added .validate {} on the --exclude option that wraps Regex() in a try-catch and calls fail() with a descriptive message

Closes #239

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• svg-to-compose/src/nativeMain/kotlin/Main.kt

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[evanofficial]

Closing — just noticed #251 already addresses this. Apologies for the duplicate!