feat: implement base of diagnostics

fe-app-podkop/src/helpers/svgEl.ts

@@ -0,0 +1,18 @@
+export function svgEl<K extends keyof SVGElementTagNameMap>(
+  tag: K,
+  attrs: Partial<Record<string, string | number>> = {},
+  children: (SVGElement | null | undefined)[] = [],
+): SVGElementTagNameMap[K] {
+  const NS = 'http://www.w3.org/2000/svg';
+  const el = document.createElementNS(NS, tag);
+
+  for (const [k, v] of Object.entries(attrs)) {
+    if (v != null) el.setAttribute(k, String(v));
+  }
+
+  (Array.isArray(children) ? children : [children])
+    .filter(Boolean)
+    .forEach((ch) => el.appendChild(ch as SVGElement));
+
+  return el;
+}