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/html-entities/dist/esm/index.d.ts

@@ -0,0 +1,20 @@
+export type Level = 'xml' | 'html4' | 'html5' | 'all';
+interface CommonOptions {
+    level?: Level;
+}
+export type EncodeMode = 'specialChars' | 'nonAscii' | 'nonAsciiPrintable' | 'nonAsciiPrintableOnly' | 'extensive';
+export interface EncodeOptions extends CommonOptions {
+    mode?: EncodeMode;
+    numeric?: 'decimal' | 'hexadecimal';
+}
+export type DecodeScope = 'strict' | 'body' | 'attribute';
+export interface DecodeOptions extends CommonOptions {
+    scope?: DecodeScope;
+}
+/** Encodes all the necessary (specified by `level`) characters in the text */
+export declare function encode(text: string | undefined | null, { mode, numeric, level }?: EncodeOptions): string;
+/** Decodes a single entity */
+export declare function decodeEntity(entity: string | undefined | null, { level }?: CommonOptions): string;
+/** Decodes all entities in the text */
+export declare function decode(text: string | undefined | null, { level, scope }?: DecodeOptions): string;
+export {};