fix: adjust input rules to be more tolerant to starting whitespace

[nperez0111]

Summary

Adjusts the input rules to allow a starting whitespace, since that is often how markdown has bullet, check, and numbered lists written

Rationale

Changes

Impact

Testing

Screenshots/Video

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

Additional Notes

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Project	Deployment	Review	Updated (UTC)
blocknote	Ready	Preview	Jan 8, 2026 1:44pm
blocknote-website	Ready	Preview	Jan 8, 2026 1:44pm

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commit: c188848