Syntax error messages need to give a clue about where in the diagram the syntax error exists.

[bradlitterell]

Describe the bug
Syntax error messages need to give a clue about where in the diagram the syntax error exists. Today the preview just shows "Syntax Error in Text" and the mermaid version, which is practically useless for a large diagram.

To Reproduce
Paste in any mermaid text with a syntax error.

Expected behavior
A clear description of the source text that generated the error, such as line number or actual fragment of the text.

Screenshots
N/A

Desktop (please complete the following information):

• OS: Windows 11
• VSCode version: 1.96.3
• Extension version: 0.19.1