fix: 修复 3D NaN 崩溃/样品图不刷新/画布点选失效

- replayShape 段过滤补 Y 轴有限值校验(此前仅校验 X)
- inferSashGlyphs bdRect 增加有限值守卫
- WindoorThreed 逐网格有限值防护 + maxDim 守卫, 杜绝 NaN 网格
- CombineCanvas shapePts 过滤非有限点, 修复包围盒污染导致的点选失效
- 组合画布引入 rev 版本号: 原地变异几何后强制 3D 预览重建
  (修复尺寸编辑后样品图不变化)

frontend/src/views/CombineView.vue

@@ -109,10 +109,14 @@ const saveName = ref('')
 const saving = ref(false)
 const canvasRef = ref()
 let uidSeq = 1
+const rev = ref(0)
 
-const combinedJson = computed(() =>
-  shapes.value.length ? JSON.stringify({ s: { cs: 60, cjs: 100 }, cp: [], sm: shapes.value,
-                                        epi: [], sbf: [], wlc: '', wall: [], scale: 0, note: [] }) : '')
+const combinedJson = computed(() => {
+  void rev.value  // 画布原地变异几何后通过版本号强制重算（驱动 3D 预览重建）
+  if (!shapes.value.length) return ''
+  return JSON.stringify({ s: { cs: 60, cjs: 100 }, cp: [], sm: shapes.value,
+                          epi: [], sbf: [], wlc: '', wall: [], scale: 0, note: [], rev: rev.value })
+})
 
 // ---------- 样板库 ----------
 async function loadLib() {
@@ -198,7 +202,7 @@ function syncSelSize() {
   if (bb) { selSize.w = Math.round(bb.x1 - bb.x0); selSize.h = Math.round(bb.y1 - bb.y0) }
 }
 
-function onCanvasChange() { refreshMeta(); syncSelSize() }
+function onCanvasChange() { refreshMeta(); syncSelSize(); rev.value++ }
 
 function onSelResize() {
   if (selSize.w >= 300 && selSize.h >= 300) canvasRef.value?.resizeSelected(selSize.w, selSize.h)