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/@webassemblyjs/leb128/esm/index.js

@@ -0,0 +1,34 @@
+import leb from "./leb";
+/**
+ * According to https://webassembly.github.io/spec/core/binary/values.html#binary-int
+ * max = ceil(32/7)
+ */
+
+export var MAX_NUMBER_OF_BYTE_U32 = 5;
+/**
+ * According to https://webassembly.github.io/spec/core/binary/values.html#binary-int
+ * max = ceil(64/7)
+ */
+
+export var MAX_NUMBER_OF_BYTE_U64 = 10;
+export function decodeInt64(encodedBuffer, index) {
+  return leb.decodeInt64(encodedBuffer, index);
+}
+export function decodeUInt64(encodedBuffer, index) {
+  return leb.decodeUInt64(encodedBuffer, index);
+}
+export function decodeInt32(encodedBuffer, index) {
+  return leb.decodeInt32(encodedBuffer, index);
+}
+export function decodeUInt32(encodedBuffer, index) {
+  return leb.decodeUInt32(encodedBuffer, index);
+}
+export function encodeU32(v) {
+  return leb.encodeUInt32(v);
+}
+export function encodeI32(v) {
+  return leb.encodeInt32(v);
+}
+export function encodeI64(v) {
+  return leb.encodeInt64(v);
+}