feat(*): Redesign UI to improve UX

src/lib/graph/canvasTokens.ts

@@ -0,0 +1,37 @@
+// Reads the graph-facing design tokens off the document root so the
+// Cytoscape stylesheet (canvas-drawn edges) always matches the CSS theme.
+// The --graph-* custom properties are plain hex on purpose: Cytoscape's
+// colour parser doesn't understand oklch() or var().
+export interface CanvasTokens {
+	bgCanvas: string;
+	edge: string;
+	border: string;
+	chipBg: string;
+	chipText: string;
+	accent: string;
+}
+
+const fallbacks: CanvasTokens = {
+	bgCanvas: '#eef0f3',
+	edge: '#8b94a3',
+	border: '#dce0e6',
+	chipBg: '#ffffff',
+	chipText: '#3a4250',
+	accent: '#3565c4'
+};
+
+export function readCanvasTokens(): CanvasTokens {
+	if (typeof document === 'undefined') {
+		return fallbacks;
+	}
+	const styles = getComputedStyle(document.documentElement);
+	const read = (name: string, fallback: string) => styles.getPropertyValue(name).trim() || fallback;
+	return {
+		bgCanvas: read('--bg-canvas', fallbacks.bgCanvas),
+		edge: read('--graph-edge', fallbacks.edge),
+		border: read('--border', fallbacks.border),
+		chipBg: read('--graph-edge-chip-bg', fallbacks.chipBg),
+		chipText: read('--graph-edge-chip-text', fallbacks.chipText),
+		accent: read('--accent', fallbacks.accent)
+	};
+}