feat(aura-cli): render leaf param signature as TYPE[...] in the graph viewer

The viewer box head built the param signature in round parens — SMA(length) —
which reads as a function call. Switch the brackets to square — SMA[length] — so
the head reads as parametrisation, not invocation. cellLabel render-only change
in graph-viewer.js; the JSON model surface and both goldens are untouched.

crates/aura-cli/assets/graph-viewer.js

@@ -70,7 +70,7 @@ function cellLabel(id, o, showTypes) {
     `<td port="${io}${i}" id="P_${id}_${io}${i}" href="#" colspan="${span(arr.length)}" ` +
     `bgcolor="${io === "i" ? "#222b33" : "#332b22"}"><font color="${col(k)}">${txt(n, k)}</font></td>`;
   const sp = o.params.map(([n, k]) => `<font color="${col(k)}">${showTypes && k ? `${n}:${k}` : n}</font>`);
-  const sig = o.params.length ? `<font color="#9399b2">(</font>${sp.join('<font color="#9399b2">, </font>')}<font color="#9399b2">)</font>` : "";
+  const sig = o.params.length ? `<font color="#9399b2">[</font>${sp.join('<font color="#9399b2">, </font>')}<font color="#9399b2">]</font>` : "";
   const name = `<font color="#f5f5f5"><b>${o.type}</b></font>${sig}`;
   let bodyRow;
   if (o.composite) {