feat(graph): add branch-coverage tests for graph-view.tsx

[d-oit]

Branch Coverage: graph-view.tsx (59.84% → ~70% branches)

What

21 targeted tests covering key branches in the graph-view.tsx component.

Coverage Areas

Area	Tests
Empty state	no entities overlay
Layout switching	force, circular, hierarchical
Focus mode	toggle on/off, filtered neighbor display
Node selection	click, click-to-deselect, Enter, Space
History controls	undo, redo with history guards
Persistence	save snapshot to localStorage
Edge handling	bad link filtering, duplicate edge removal
Node display	long name truncation, entity type legend
Counts	node/edge counts in toolbar, focus mode counts

[vercel]

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Project	Deployment	Actions	Updated (UTC)
do-knowledge-studio	Ready	Preview, v0	Jul 30, 2026 6:58pm

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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