Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/recharts/es6/state/errorBarSlice.js

@@ -0,0 +1,47 @@
+import { createSlice } from '@reduxjs/toolkit';
+
+/**
+ * ErrorBars have lot more settings but all the others are scoped to the component itself.
+ * Only some of them required to be reported to the global store because XAxis and YAxis need to know
+ * if the error bar is contributing to extending the axis domain.
+ */
+
+var initialState = {};
+var errorBarSlice = createSlice({
+  name: 'errorBars',
+  initialState,
+  reducers: {
+    addErrorBar: (state, action) => {
+      var _action$payload = action.payload,
+        itemId = _action$payload.itemId,
+        errorBar = _action$payload.errorBar;
+      if (!state[itemId]) {
+        state[itemId] = [];
+      }
+      state[itemId].push(errorBar);
+    },
+    replaceErrorBar: (state, action) => {
+      var _action$payload2 = action.payload,
+        itemId = _action$payload2.itemId,
+        prev = _action$payload2.prev,
+        next = _action$payload2.next;
+      if (state[itemId]) {
+        state[itemId] = state[itemId].map(e => e.dataKey === prev.dataKey && e.direction === prev.direction ? next : e);
+      }
+    },
+    removeErrorBar: (state, action) => {
+      var _action$payload3 = action.payload,
+        itemId = _action$payload3.itemId,
+        errorBar = _action$payload3.errorBar;
+      if (state[itemId]) {
+        state[itemId] = state[itemId].filter(e => e.dataKey !== errorBar.dataKey || e.direction !== errorBar.direction);
+      }
+    }
+  }
+});
+var _errorBarSlice$action = errorBarSlice.actions,
+  addErrorBar = _errorBarSlice$action.addErrorBar,
+  replaceErrorBar = _errorBarSlice$action.replaceErrorBar,
+  removeErrorBar = _errorBarSlice$action.removeErrorBar;
+export { addErrorBar, replaceErrorBar, removeErrorBar };
+export var errorBarReducer = errorBarSlice.reducer;