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/@standard-schema/utils/dist/index.d.ts

@@ -0,0 +1,28 @@
+import { StandardSchemaV1 } from '@standard-schema/spec';
+
+/**
+ * Creates and returns the dot path of an issue if possible.
+ *
+ * @param issue The issue to get the dot path from.
+ *
+ * @returns The dot path or null.
+ */
+declare function getDotPath(issue: StandardSchemaV1.Issue): string | null;
+
+/**
+ * A schema error with useful information.
+ */
+declare class SchemaError extends Error {
+    /**
+     * The schema issues.
+     */
+    readonly issues: ReadonlyArray<StandardSchemaV1.Issue>;
+    /**
+     * Creates a schema error with useful information.
+     *
+     * @param issues The schema issues.
+     */
+    constructor(issues: ReadonlyArray<StandardSchemaV1.Issue>);
+}
+
+export { SchemaError, getDotPath };