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/workbox-precaching/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "extends": "../../tsconfig",
+  "compilerOptions": {
+    "outDir": "./",
+    "rootDir": "./src",
+    "tsBuildInfoFile": "./tsconfig.tsbuildinfo"
+  },
+  "include": ["src/**/*.ts"],
+  "references": [
+    {"path": "../workbox-core/"},
+    {"path": "../workbox-routing/"},
+    {"path": "../workbox-strategies/"}
+  ]
+}