Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/immer/dist/core/proxy.d.ts

@@ -0,0 +1,38 @@
+import { ImmerBaseState, ImmerState, Drafted, AnyObject, AnyArray, Objectish, ProxyType } from "../internal";
+interface ProxyBaseState extends ImmerBaseState {
+    assigned_: {
+        [property: string]: boolean;
+    };
+    parent_?: ImmerState;
+    revoke_(): void;
+}
+export interface ProxyObjectState extends ProxyBaseState {
+    type_: ProxyType.ProxyObject;
+    base_: any;
+    copy_: any;
+    draft_: Drafted<AnyObject, ProxyObjectState>;
+}
+export interface ProxyArrayState extends ProxyBaseState {
+    type_: ProxyType.ProxyArray;
+    base_: AnyArray;
+    copy_: AnyArray | null;
+    draft_: Drafted<AnyArray, ProxyArrayState>;
+}
+declare type ProxyState = ProxyObjectState | ProxyArrayState;
+/**
+ * Returns a new draft of the `base` object.
+ *
+ * The second argument is the parent draft-state (used internally).
+ */
+export declare function createProxyProxy<T extends Objectish>(base: T, parent?: ImmerState): Drafted<T, ProxyState>;
+/**
+ * Object drafts
+ */
+export declare const objectTraps: ProxyHandler<ProxyState>;
+export declare function markChanged(state: ImmerState): void;
+export declare function prepareCopy(state: {
+    base_: any;
+    copy_: any;
+}): void;
+export {};
+//# sourceMappingURL=proxy.d.ts.map