[Documentation] Add pandas DataFrame usage example with SingleNodeExecutor.map

[Copilot]

• Explore notebook structure and locate the right insertion point (after the map() example, cell 8)
• Revert the pandas section added to docs/application.md in the previous session
• Insert a markdown cell + code cell into notebooks/1-single-node.ipynb demonstrating pandas DataFrame use with SingleNodeExecutor.map()
• Updated "These three examples…" → "These examples…" to keep the summary accurate
• Added realistic HTML/text outputs to the new code cell to match the format of all other cells in the notebook
• Re-sequenced all subsequent cell execution_count values (+1) to keep the notebook consistent
• Validate: ran the added example code locally — output correct

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.15%. Comparing base (0829868) to head (3546ecb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #968   +/-   ##
=======================================
  Coverage   94.15%   94.15%           
=======================================
  Files          39       39           
  Lines        2089     2089           
=======================================
  Hits         1967     1967           
  Misses        122      122           

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