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/@csstools/postcss-cascade-layers/CHANGELOG.md

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+# Changes to PostCSS Cascade Layers
+
+### 1.1.1 (September 17, 2022)
+
+- Fix pre-defined layer order in nested `@layer` rules.
+
+### 1.1.0 (September 14, 2022)
+
+- Add support for `@scope` and `@container` as parent rules for `@layer`
+
+### 1.0.6 (September 7, 2022)
+
+- Fix broken `@keyframes` in `@layer`.
+
+### 1.0.5 (July 8, 2022)
+
+- Fix case insensitive `@layer` matching (`@LaYeR`).
+- Updated `@csstools/selector-specificity` to `2.0.2` (patch)
+
+### 1.0.4 (June 23, 2022)
+
+- Fix selector order with any pseudo element. This plugin will no longer re-order selectors.
+
+### 1.0.3 (June 4, 2022)
+
+- Update `@csstools/selector-specificity` (major)
+
+### 1.0.2 (May 20, 2022)
+
+- Use only simple `:not(#\#)` selectors to adjust specificity.
+
+### 1.0.1 (May 17, 2022)
+
+- Process CSS after most other plugins to ensure correct analysis and transformation of sugary CSS.
+- Fix selector order with `:before` and other pseudo elements.
+
+### 1.0.0 (May 12, 2022)
+
+- Initial version