chore: add prettier for code formatting

- add .prettierrc with project style rules
- add format and format:check scripts to package.json
- add format check step to PR workflow

Author: Tarquinen

.github/workflows/pr-checks.yml

@@ -1,33 +1,36 @@
 name: PR Checks
 
 on:
-  pull_request:
-    branches: [master, dev]
+    pull_request:
+        branches: [master, dev]
 
 jobs:
-  validate:
-    name: Type Check, Build & Audit
-    runs-on: ubuntu-latest
-    
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '20'
-          cache: 'npm'
-      
-      - name: Install dependencies
-        run: npm ci
-      
-      - name: Type check
-        run: npm run typecheck
-      
-      - name: Build
-        run: npm run build
-      
-      - name: Security audit
-        run: npm audit --audit-level=high
-        continue-on-error: false
+    validate:
+        name: Type Check, Build & Audit
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v4
+
+            - name: Setup Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: "20"
+                  cache: "npm"
+
+            - name: Install dependencies
+              run: npm ci
+
+            - name: Format check
+              run: npm run format:check
+
+            - name: Type check
+              run: npm run typecheck
+
+            - name: Build
+              run: npm run build
+
+            - name: Security audit
+              run: npm audit --audit-level=high
+              continue-on-error: false

.prettierrc

@@ -0,0 +1,10 @@
+{
+    "semi": false,
+    "singleQuote": false,
+    "tabWidth": 4,
+    "useTabs": false,
+    "trailingComma": "all",
+    "printWidth": 100,
+    "bracketSpacing": true,
+    "arrowParens": "always"
+}