feat: add Prettier and pre-commit hooks

- Add Prettier for consistent CSS formatting
- Add Husky + lint-staged for pre-commit checks
- Pre-commit runs: prettier --check, validate-css.js
- CI runs both format check and CSS validation
- Format all CSS files with Prettier

Author: swernerx

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   validate:
-    name: Validate CSS
+    name: Validate & Format
     runs-on: ubuntu-latest
 
     steps:
@@ -24,5 +24,8 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Validate CSS with LightningCSS
-        run: npm run check
+      - name: Check CSS formatting (Prettier)
+        run: npm run check:format
+
+      - name: Validate CSS syntax (LightningCSS)
+        run: npm run check:css

.husky/pre-commit

@@ -0,0 +1,2 @@
+npx lint-staged
+

.prettierignore

@@ -0,0 +1,3 @@
+node_modules
+dist
+

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "printWidth": 100,
+  "singleQuote": false,
+  "tabWidth": 2,
+  "useTabs": false
+}
+