Add Knowledge Graph visualization, builder, and tests

[nareshAiNexus]

Motivation

• Provide a visual map of relationships between notes based on shared key terms to help discovery and navigation.
• Expose the graph from the UI via the sidebar and the command palette for quick access.

Description

• Add a graph builder buildKnowledgeGraph in src/lib/knowledge-graph.ts that tokenizes note text, ranks terms, computes Jaccard similarity, and outputs nodes and weighted edges.
• Add KnowledgeGraphDialog component in src/components/KnowledgeGraphDialog.tsx that renders an SVG force-like layout, shows link strengths and shared terms, and opens notes on node click.
• Wire the dialog into the app by adding a sidebar button and command palette entry, and by passing onOpenKnowledgeGraph and knowledgeGraphOpen state through Sidebar and Index.
• Include a unit test file src/test/knowledge-graph.test.ts that verifies edge creation for related notes and absence of edges for disjoint notes.

Testing

• Added unit tests in src/test/knowledge-graph.test.ts covering related and disjoint notes using buildKnowledgeGraph and ran them with vitest via npm run test.
• All added tests succeeded.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
crossnotes	Ready	Preview, Comment	Mar 9, 2026 5:05am