Speedups

[TeunHuijben]

Two perf fixes in GraphView, both on hot paths used by interactive editing
(BBoxSpatialFilter, GraphArrayView).

• remove_node: replaced O(E²) bookkeeping cleanup with an O(degree) capture
  of incident edges before the node is removed. Measured on a 2000-node /
  density-5 view, 50 deletions: 52s → 2ms (~22000×).

• update_node_attrs: when a listener is attached, the signal payload used to
  require two queries to root (old attrs + new attrs). The new attrs are now
  derived by overlaying the applied attrs onto old_attrs, saving one
  query. ~3-6× on small interactive batches with SQL backend; neutral
  otherwise.

• Adds a benchmark for the listener-attached update_node_attrs path so the
  gain is visible in ASV comparisons going forward.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.73%. Comparing base (14b92ec) to head (5138caa).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_graph_view.py	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #291   +/-   ##
=======================================
  Coverage   87.73%   87.73%           
=======================================
  Files          57       57           
  Lines        4890     4892    +2     
  Branches      862      862           
=======================================
+ Hits         4290     4292    +2     
  Misses        378      378           
  Partials      222      222           

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