fix: preserve calibration draft on refresh

web/src/main.js

@@ -2,6 +2,7 @@ import "./styles.css";
 
 const zoneIds = ["r1c1", "r1c2", "r1c3", "r1c4", "r2c1", "r2c2", "r2c3", "r2c4"];
 const allRegions = [...zoneIds, "trash"];
+const draftStorageKey = "cold-display-guard.calibrationDraft.v1";
 const palette = {
   r1c1: "#d92d20",
   r1c2: "#b54708",
@@ -133,6 +134,7 @@ const ctx = els.canvas.getContext("2d");
 
 function boot() {
   wireEvents();
+  loadDraftPolygons();
   renderRegionList();
   refreshAll();
 }
@@ -164,7 +166,9 @@ async function refreshAll() {
     state.summary = summary;
     state.events = events.items || [];
     fillForm();
+    if (!hasAnyPolygon()) {
       loadPolygonsFromConfig(false);
+    }
     render();
     setStatus("已连接后端 19080");
   } catch (error) {
@@ -185,6 +189,7 @@ async function saveConfig() {
     };
     state.config = await apiJson("/api/manage/config", {method: "PUT", body: payload});
     const calibrationSaved = await persistCalibration({requireAny: false});
+    saveDraftPolygons();
     fillForm();
     renderConfigPreview();
     setStatus(calibrationSaved ? "配置和标定已保存" : "配置已保存；当前没有可保存的标定点");
@@ -228,6 +233,7 @@ async function saveCalibration() {
   try {
     const saved = await persistCalibration({requireAny: true});
     if (saved) {
+      saveDraftPolygons();
       render();
       setStatus("标定已保存到项目配置");
     }
@@ -289,6 +295,7 @@ function loadPolygonsFromConfig(updateStatus = true) {
   if (Array.isArray(state.config.trash?.roi)) {
     state.polygons.trash = state.config.trash.roi.map(([x, y]) => ({x, y}));
   }
+  saveDraftPolygons();
   render();
   if (updateStatus) {
     setStatus("已载入当前配置区域");
@@ -335,6 +342,7 @@ function addPoint(event) {
   const x = clamp(rawX / imageRect.width);
   const y = clamp(rawY / imageRect.height);
   state.polygons[state.activeRegion].push({x: round(x), y: round(y)});
+  saveDraftPolygons();
   render();
 }
 
@@ -362,14 +370,44 @@ function getCanvasImageRect() {
 
 function undoPoint() {
   state.polygons[state.activeRegion].pop();
+  saveDraftPolygons();
   render();
 }
 
 function clearRegion() {
   state.polygons[state.activeRegion] = [];
+  saveDraftPolygons();
   render();
 }
 
+function hasAnyPolygon() {
+  return allRegions.some((id) => state.polygons[id].length > 0);
+}
+
+function saveDraftPolygons() {
+  localStorage.setItem(draftStorageKey, JSON.stringify(state.polygons));
+}
+
+function loadDraftPolygons() {
+  const raw = localStorage.getItem(draftStorageKey);
+  if (!raw) {
+    return;
+  }
+  try {
+    const draft = JSON.parse(raw);
+    for (const id of allRegions) {
+      if (!Array.isArray(draft[id])) {
+        continue;
+      }
+      state.polygons[id] = draft[id]
+        .filter((point) => Number.isFinite(point.x) && Number.isFinite(point.y))
+        .map((point) => ({x: clamp(point.x), y: clamp(point.y)}));
+    }
+  } catch {
+    localStorage.removeItem(draftStorageKey);
+  }
+}
+
 function drawCanvas() {
   ctx.clearRect(0, 0, els.canvas.width, els.canvas.height);
   if (state.image) {