Keep an output's name readable beside a long inline value (#306)

An input and an output in the same port row were cut to fit each on
its own. The input text could reach x = 123 and the output label could
start at x = 83, so a long inline value ran under the output's name.
At Animation playing a long animation name covered "progress".

- The output label is placed first and keeps its room. The input text
  is cut with an ellipsis 6 px before it, as decided in the issue.
- The rule is a pure function in src/editor/graph/portRow.ts. A row
  without an output keeps the input's old limit of 108 px.
- The value a run shows beside an output uses the same rule. Its left
  edge can no longer lie right of its right edge.
- New test hook __gm.graph.rowSpans(nodeId) gives each row's input
  and output text as cut and placed, in node units.
- NODE_WIDTH stays as it is, as decided in the issue.

Tests:
- Gate: 230 files, 3520 tests (6 new in port-row.test.ts).
- e2e 6: all passed, 149 checks (148 + 1).
- Counter-check: with the rule switched off, the input text reaches
  x = 121.4 under "progress" at x = 114.1, and the new check fails.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/editor/graph/GraphCanvas.ts

@@ -1140,6 +1140,10 @@ export class GraphCanvas extends Widget {
     return this.views.get(nodeId)?.outputLines ?? null;
   }
 
+  nodeRowSpans(nodeId: string): NodeView['rowSpans'] | null {
+    return this.views.get(nodeId)?.rowSpans ?? null;
+  }
+
   /** Global screen position of a node's title bar centre. */
   nodeGlobal(nodeId: string): { x: number; y: number } | null {
     const view = this.views.get(nodeId);