Added feature File Path Links - Agent Mode

[shubhamgore2468]

What does this PR do?

When the agent mentions a file in its response (e.g. results.csv, sales_data.xlsx), the filename is now rendered as a clickable link. Clicking it opens the file directly in JupyterLab.

How it works

• File references are detected in agent messages using a regex that matches filenames with common data/notebook extensions (.csv, .xlsx, .json, .parquet, .py, .ipynb, etc.)
• Detected filenames are replaced with placeholder tokens before markdown rendering, then injected back as clickable <span> elements using the same React Portal pattern already used for citations and cell references
• The filename is resolved relative to the notebook's directory so that files saved by the kernel can be found correctly
• Filenames inside backtick code spans are not converted to links since they live inside <code> DOM elements which the text node walker skips

Files changed

• MarkdownBlock.tsx — file ref extraction, placeholder injection, and click handler
• ChatMessage.tsx — passes app prop down to MarkdownBlock
• CellReference.css — adds .file-reference styles

[vercel]

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