docs: fix network-analysis.md labels, API methods, and shortestPath note

[DecisionNerd]

Summary

• Wrong SNAP dataset labels — all queries used :Person/FRIEND_OF but snap-ego-facebook loads as :Node/CONNECTED_TO (per snap.json); all 10 affected query blocks corrected
• Stale export pattern — to_dataframe section showed a manual helper function and a nx.DiGraph() loop; replaced with db.to_dataframe(query) and db.to_networkx() / db.to_networkx(node_label=, rel_type=) from the shipped v0.3.9 API
• shortestPath() note updated — clarified it now raises NotImplementedError (per fix: shortestPath() causes SyntaxError — parser does not recognise the function #468 fix in fix: shortestPath() / allShortestPaths() parse and raise NotImplementedError #497) and the BFS pattern shown is the intended workaround

Test plan

• All Cypher queries use :Node / CONNECTED_TO (matching actual dataset schema)
• to_dataframe section uses db.to_dataframe(query) — no manual helper
• NetworkX section uses db.to_networkx() and documents node_label/rel_type filtering
• shortestPath() note is accurate: raises NotImplementedError, BFS workaround shown
• make pre-push-fast passes

Closes #477

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.05%. Comparing base (487632a) to head (463f40c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #498   +/-   ##
=======================================
  Coverage   88.05%   88.05%           
=======================================
  Files          40       40           
  Lines       14513    14513           
  Branches     3439     3439           
=======================================
  Hits        12779    12779           
  Misses       1141     1141           
  Partials      593      593           

Flag	Coverage Δ
full-coverage	88.05% <ø> (ø)

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Components	Coverage Δ
parser	95.49% <ø> (ø)
planner	83.07% <ø> (ø)
executor	83.63% <ø> (ø)
storage	91.25% <ø> (ø)
ast	98.22% <ø> (ø)
types	94.75% <ø> (ø)

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