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/@bcoe/v8-coverage/dist/lib/compare.d.ts

@@ -0,0 +1,21 @@
+import { FunctionCov, RangeCov, ScriptCov } from "./types";
+/**
+ * Compares two script coverages.
+ *
+ * The result corresponds to the comparison of their `url` value (alphabetical sort).
+ */
+export declare function compareScriptCovs(a: Readonly<ScriptCov>, b: Readonly<ScriptCov>): number;
+/**
+ * Compares two function coverages.
+ *
+ * The result corresponds to the comparison of the root ranges.
+ */
+export declare function compareFunctionCovs(a: Readonly<FunctionCov>, b: Readonly<FunctionCov>): number;
+/**
+ * Compares two range coverages.
+ *
+ * The ranges are first ordered by ascending `startOffset` and then by
+ * descending `endOffset`.
+ * This corresponds to a pre-order tree traversal.
+ */
+export declare function compareRangeCovs(a: Readonly<RangeCov>, b: Readonly<RangeCov>): number;