fix: add --legacy-peer-deps for Angular 21 compatibility (#63)

* Initial plan

* fix: add --legacy-peer-deps to npm ci for Angular 21 compatibility

Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

.github/workflows/pr-validation.yml

@@ -20,7 +20,7 @@ jobs:
                   cache: 'npm'
 
             - name: Install dependencies
-              run: npm ci
+              run: npm ci --legacy-peer-deps
 
             - name: Check code formatting with Prettier
               run: npx prettier --check "src/**/*.{ts,html,scss,css,json}"
@@ -41,7 +41,7 @@ jobs:
                   cache: 'npm'
 
             - name: Install dependencies
-              run: npm ci
+              run: npm ci --legacy-peer-deps
 
             - name: Run TypeScript compiler
               run: npx tsc --noEmit
@@ -59,7 +59,7 @@ jobs:
                   cache: 'npm'
 
             - name: Install dependencies
-              run: npm ci
+              run: npm ci --legacy-peer-deps
 
             - name: Run unit tests
               run: npm test -- --watch=false --browsers=ChromeHeadless --code-coverage
@@ -85,7 +85,7 @@ jobs:
                   cache: 'npm'
 
             - name: Install dependencies
-              run: npm ci
+              run: npm ci --legacy-peer-deps
 
             - name: Build production bundle
               run: npm run build -- --configuration production