feat: v1.6 组合画布编辑能力增强

- 选中单元可视化: 蓝色虚线框+四角手柄+实时尺寸标注
- 精确尺寸编辑: 工具栏 W/H 输入框(几何按比例缩放, 锚定左下角)
- 方向键微调: 1mm/Shift+方向键 10mm
- 右侧单元清单点击选中与画布联动, selSize 双向同步

frontend/src/components/CombineCanvas.vue

@@ -218,6 +218,27 @@ function render() {
   for (const h of guides.h) { ctx.beginPath(); ctx.moveTo(0, ty(h)); ctx.lineTo(W, ty(h)); ctx.stroke() }
   ctx.setLineDash([])
 
+  // 选中单元: 蓝色虚线框 + 角点手柄 + 尺寸标注
+  if (selectedUid.value !== null) {
+    const bb = unitBBox(selectedUid.value)
+    if (bb) {
+      const x0 = tx(bb.x0), x1 = tx(bb.x1), y0 = ty(bb.y1), y1 = ty(bb.y0)
+      ctx.strokeStyle = '#409eff'
+      ctx.setLineDash([6, 4])
+      ctx.lineWidth = 1.5
+      ctx.strokeRect(x0 - 4, y0 - 4, (x1 - x0) + 8, (y1 - y0) + 8)
+      ctx.setLineDash([])
+      ctx.fillStyle = '#409eff'
+      for (const [hx, hy] of [[x0, y0], [x1, y0], [x0, y1], [x1, y1]]) {
+        ctx.fillRect(hx - 4, hy - 4, 8, 8)
+      }
+      ctx.font = 'bold 12px sans-serif'
+      ctx.textAlign = 'center'
+      ctx.fillText(`${Math.round(bb.x1 - bb.x0)} × ${Math.round(bb.y1 - bb.y0)} mm`, (x0 + x1) / 2, y0 - 10)
+      ctx.textAlign = 'left'
+    }
+  }
+
   hint.value = `${uids().length} 个单元 · 总尺寸 ${Math.round(gw)} × ${Math.round(gh)} mm`
 }
 
@@ -308,6 +329,37 @@ function modelAt(clientX: number, clientY: number): Pt {
 }
 
 function refresh() { render() }
+
+/** 选中单元缩放到目标尺寸（几何按比例缩放，锚定自身左下角） */
+function resizeSelected(newW: number, newH: number) {
+  if (selectedUid.value === null) return
+  const target = props.shapes.filter(s => s.__uid === selectedUid.value)
+  const bb = bbOfLocal(target)
+  if (!bb) return
+  const w = bb.x1 - bb.x0, h = bb.y1 - bb.y0
+  if (w < 10 || h < 10) return
+  const sx = Math.max(0.05, newW / w), sy = Math.max(0.05, newH / h)
+  const scX = (p: any) => { p.x = bb.x0 + (p.x - bb.x0) * sx }
+  const scY = (p: any) => { p.y = bb.y0 + (p.y - bb.y0) * sy }
+  for (const s of target) {
+    for (const r of (s.polygon?.polygon ?? [])) {
+      for (const seg of r) { scX(seg.ps); scY(seg.ps); scX(seg.pe); scY(seg.pe) }
+    }
+    for (const sp of (s.mm?.sp ?? [])) { scX(sp.line.pt); scY(sp.line.pt) }
+    for (const sub of (s.sm ?? [])) if (sub.bd) { scX(sub.bd.from); scY(sub.bd.from); scX(sub.bd.to); scY(sub.bd.to) }
+  }
+  refresh()
+  emit('change')
+}
+
+/** 方向键微调（mm） */
+function nudgeSelected(dx: number, dy: number) {
+  if (selectedUid.value === null) return
+  translateUid(selectedUid.value, dx, dy)
+  refresh()
+  emit('change')
+}
+
 function exportDrawing(): string | null {
   if (!props.shapes.length) return null
   return JSON.stringify({
@@ -315,7 +367,7 @@ function exportDrawing(): string | null {
     epi: [], sbf: [], wlc: '', wall: [], scale: 0, note: [],
   })
 }
-defineExpose({ refresh, modelAt, exportDrawing, rotateUnit, mirrorUnit })
+defineExpose({ refresh, modelAt, exportDrawing, rotateUnit, mirrorUnit, resizeSelected, nudgeSelected })
 
 onMounted(() => {
   watch(() => props.shapes, () => { selectedUid.value = null; rebuild() }, { immediate: true })

frontend/src/views/CombineView.vue

@@ -34,6 +34,13 @@
               <el-tooltip content="选中单元水平镜像" placement="top">
                 <el-button size="small" :disabled="!selectedUid" @click="canvasRef?.mirrorUnit(selectedUid!)">⇋ 镜像</el-button>
               </el-tooltip>
+              <template v-if="selectedUid">
+                <span style="font-size:12px; color:#909399">尺寸</span>
+                <el-input-number v-model="selSize.w" :min="300" :step="10" size="small" controls-position="right"
+                                 style="width:96px" @change="onSelResize" />
+                <el-input-number v-model="selSize.h" :min="300" :step="10" size="small" controls-position="right"
+                                 style="width:96px" @change="onSelResize" />
+              </template>
               <el-divider direction="vertical" />
               <el-button size="small" :disabled="!selectedUid" @click="alignBottom">底边对齐</el-button>
               <el-button size="small" :disabled="!selectedUid" type="danger" plain @click="deleteSelected">删除单元</el-button>
@@ -42,7 +49,7 @@
           </div>
         </template>
         <div class="canvas-box" @drop="onDrop" style="position:relative">
-          <CombineCanvas ref="canvasRef" :shapes="shapes" @select="onSelect" @change="refreshMeta" />
+          <CombineCanvas ref="canvasRef" :shapes="shapes" @select="onSelect" @change="onCanvasChange" />
         </div>
         <div class="save-bar">
           <el-input v-model="saveName" placeholder="组合样板名称（如：三扇组合窗）" style="flex:1" />
@@ -84,7 +91,7 @@
  * 数据模型：shapes = 多形状 drawing_data 的 sm[]（每形状打 __uid 单元标记）；
  * 组合结果与渲染/报价/AI 炫图/3D 全链路兼容，可另存为"我的样板"。
  */
-import { computed, onMounted, onBeforeUnmount, ref } from 'vue'
+import { computed, onBeforeUnmount, onMounted, reactive, ref } from 'vue'
 import { ElMessage } from 'element-plus'
 import { api } from '../api'
 import { parseDrawing } from '../types/drawing'
@@ -181,7 +188,21 @@ async function onDrop(e: DragEvent) {
 }
 
 // ---------- 单元操作 ----------
-function onSelect(uid: number | null) { selectedUid.value = uid }
+function onSelect(uid: number | null) { selectedUid.value = uid; syncSelSize() }
+
+const selSize = reactive({ w: 0, h: 0 })
+
+function syncSelSize() {
+  if (selectedUid.value === null) { selSize.w = selSize.h = 0; return }
+  const bb = bbOf(shapes.value.filter(s => s.__uid === selectedUid.value))
+  if (bb) { selSize.w = Math.round(bb.x1 - bb.x0); selSize.h = Math.round(bb.y1 - bb.y0) }
+}
+
+function onCanvasChange() { refreshMeta(); syncSelSize() }
+
+function onSelResize() {
+  if (selSize.w >= 300 && selSize.h >= 300) canvasRef.value?.resizeSelected(selSize.w, selSize.h)
+}
 function selectUnit(uid: number) { selectedUid.value = uid; canvasRef.value?.refresh() }
 
 function refreshMeta() {
@@ -249,7 +270,13 @@ async function saveAsTemplate() {
 }
 
 function onKeydown(e: KeyboardEvent) {
-  if (e.key === 'Delete' && selectedUid.value !== null) deleteSelected()
+  if (e.key === 'Delete' && selectedUid.value !== null) { deleteSelected(); return }
+  // 方向键微调选中单元（1mm，Shift=10mm）
+  if (selectedUid.value !== null && e.key.startsWith('Arrow')) {
+    const step = e.shiftKey ? 10 : 1
+    const d = { ArrowLeft: [-step, 0], ArrowRight: [step, 0], ArrowUp: [0, step], ArrowDown: [0, -step] }[e.key] as [number, number] | undefined
+    if (d) { e.preventDefault(); canvasRef.value?.nudgeSelected(d[0], d[1]) }
+  }
 }
 
 onMounted(async () => {