No Preview for .mermaid docs in VSCode insiders: has console errors

[OzBob]

When i open a .mermaid or .mmd file e.g. sequenceDiagram, the preview does not display. The preview does display for .md files.

I have MermaidChart.vscode-mermaid-chart and vstirbu.vscode-mermaid-preview installed

On startup my vscode insiders has the following errors and warnings.

1. ERR Extension 'mermaidchart.vscode-mermaid-chart' wants API proposal 'languageModelToolsForAgent' but that proposal DOES NOT EXIST. Likely, the proposal has been finalized (check 'vscode.d.ts') or was abandoned.
2. ERR Extension 'vstirbu.vscode-mermaid-preview' wants API proposal 'languageModelToolsForAgent' but that proposal DOES NOT EXIST. Likely, the proposal has been finalized (check 'vscode.d.ts') or was abandoned.
3. Overwriting grammar scope name to file mapping for scope source.mermaid.flowchart. Old grammar file: file:///c%3A/Users/robma/.vscode-insiders/extensions/mermaidchart.vscode-mermaid-chart-2.5.4/syntaxes/mermaid-flowchart.tmLanguage.json. New grammar file: file:///c%3A/Users/robma/.vscode-insiders/extensions/vstirbu.vscode-mermaid-preview-2.1.2/syntaxes/mermaid-flowchart.tmLanguage.json
4. log.ts:450 WARN Authentication provider mermaidchart was not declared in the Extension Manifest.
5. log.ts:450 WARN Authentication provider preview_mermaidchart was not declared in the Extension Manifest.

Might be related to #159