feat: entity graph app with theme-aware colors, icons, filters, and blast radius
New EntityGraph.svelte app (sigma.js + graphology): - Theme-aware Gruvbox palettes (light/dark) with reactive color switching - Lucide icons rendered synchronously via Path2D canvas per entity type - Color mode toggle (Health / Type) with per-type distinct colors - Health distribution bar with clickable filters - Entity type filters grouped by ontological layer (collapsible) - Relationship type edge filters with color-coded swatches - Quick presets: All / Problems / Infra - Node selection with live blast radius from API - Hover neighborhood highlighting with muted fade - Isolated node hiding, edge alpha tuning, dot-grid background - Search with camera focus on highest-degree match
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