Workflow drawer flowchart: wires dangle, nodes overlap the parallel frame, run summary unclamped #1652

Reported by the owner on the workflow stage drawer for FlyBot PR 快线 (narrow drawer, ~400–530px): 「这个流程图显示的效果很差，连线都是乱的」.

Observed:

• a long empty vertical line above the graph, and stray vertical/horizontal wire segments attached to no node;
• the parallel-branch dashed frame (「并行分支 · 全部通过后汇合」) has wires crossing outside the nodes, and nodes overlap the frame;
• the run description card above the graph is a long raw text blob (task summary with shas, timestamps…).

Expected: wires connect node to node (fork/join from one point, orthogonal, computed from the drawn boxes after layout/resize), no dangling segments, no huge gap, the graph fits narrow widths, and the run summary is clamped to 2–3 lines with an expand control.

Likely cause to verify: .wf-node / .wf-par declare position:relative after .wf-abs{position:absolute}, so drawn boxes fall back into normal flow while the SVG wires use the stored absolute coordinates.