feat: upgrade design system to v0.1.19, use onNavigate/fillHeight, add SonarQube workflow

- Use Sidebar onNavigate callback instead of display:contents click interception
- Use DataTable fillHeight prop instead of manual scroll wrapper divs
- Fix DataTable scroll/pagination by adding overflow:hidden to content container
- Fix left panel in split view to use flex column instead of overflow:auto
- Make error tab stack trace scrollable for large traces
- Add nightly SonarQube workflow with manual trigger support

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/sonarqube.yml

@@ -0,0 +1,57 @@
+name: SonarQube
+
+on:
+  schedule:
+    - cron: '0 2 * * *'
+  workflow_dispatch:
+
+jobs:
+  sonarqube:
+    runs-on: ubuntu-latest
+    container:
+      image: gitea.siegeln.net/cameleer/cameleer-build:1
+      credentials:
+        username: cameleer
+        password: ${{ secrets.REGISTRY_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Configure Gitea Maven Registry
+        run: |
+          mkdir -p ~/.m2
+          cat > ~/.m2/settings.xml << 'SETTINGS'
+          <settings>
+            <servers>
+              <server>
+                <id>gitea</id>
+                <username>cameleer</username>
+                <password>${env.REGISTRY_TOKEN}</password>
+              </server>
+            </servers>
+          </settings>
+          SETTINGS
+        env:
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Cache Maven dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-maven-
+
+      - name: Build and Test with coverage
+        run: mvn clean verify -DskipITs -U --batch-mode
+
+      - name: SonarQube Analysis
+        run: |
+          mvn sonar:sonar --batch-mode \
+            -Dsonar.host.url="$SONAR_HOST_URL" \
+            -Dsonar.token="$SONAR_TOKEN" \
+            -Dsonar.projectKey=cameleer3-server \
+            -Dsonar.projectName="Cameleer3 Server"
+        env:
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}