feat(miniprogram): add local QR temp-file helper via uqrcodejs.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/utils/makeQrTempFile.js

@@ -0,0 +1,53 @@
+import UQRCode from 'uqrcodejs'
+
+/**
+ * 在组件内隐藏 canvas 上绘制二维码，导出临时文件路径供 <image> 展示。
+ * @param {object} opts
+ * @param {string} opts.text 二维码内容（出入库单 id）
+ * @param {string} opts.canvasId canvas-id
+ * @param {object} opts.componentInstance 组件实例（getCurrentInstance().proxy）
+ * @param {number} [opts.size=200]
+ * @returns {Promise<string>} tempFilePath
+ */
+export function makeQrTempFile({ text, canvasId, componentInstance, size = 200 }) {
+  const content = String(text || '').trim()
+  if (!content) {
+    return Promise.reject(new Error('二维码内容为空'))
+  }
+  if (!componentInstance) {
+    return Promise.reject(new Error('缺少组件实例'))
+  }
+
+  return new Promise((resolve, reject) => {
+    try {
+      const qr = new UQRCode()
+      qr.data = content
+      qr.size = size
+      qr.margin = 10
+      qr.make()
+      const ctx = uni.createCanvasContext(canvasId, componentInstance)
+      qr.canvasContext = ctx
+      qr.drawCanvas()
+      // drawCanvas 内部会 ctx.draw；稍延迟再导出
+      setTimeout(() => {
+        uni.canvasToTempFilePath(
+          {
+            canvasId,
+            width: size,
+            height: size,
+            destWidth: size,
+            destHeight: size,
+            success: (res) => {
+              if (res.tempFilePath) resolve(res.tempFilePath)
+              else reject(new Error('二维码导出失败'))
+            },
+            fail: (err) => reject(err || new Error('二维码导出失败'))
+          },
+          componentInstance
+        )
+      }, 120)
+    } catch (e) {
+      reject(e)
+    }
+  })
+}