Optimize error messages throw by observable transpile function

[pearmini]

• Before it stops running the notebook and displays error messages at the top of the notebook.
• Now it only stops invalid block and displays error messages at the top of the current block.

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[Copilot]

Pull Request Overview

This PR improves error handling in the observable transpile function by changing from a global error approach to a block-level error approach. Instead of stopping the entire notebook when a syntax error occurs, it now continues running other blocks and displays error messages at the block level.

• Removed global syntax error tracking and early termination logic
• Modified error handling to store syntax errors at the block level and continue processing
• Updated observer to prioritize syntax errors over runtime errors in error display

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
runtime/index.js	Updated error handling logic to support block-level error reporting instead of global notebook termination
test/js/syntax-error2.js	Modified test case to use multi-line format with additional executable code
test/output/syntaxError2.js	Updated expected test output to reflect new block-level error handling behavior

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