Toolbox 30rem sticky + accordéons collapsibles + renommage libreDecision

- Boîte à outils élargie à 30rem (×1.75) — flottante sticky, zéro scroll visible
- ToolboxSection : nouveau composant accordéon générique (chevron, défaut fermé)
- ToolboxVignette : titre cliquable, bullets/actions cachés par défaut
- 4 pages : ContextMapper/SocioElection/WorkflowMilestones/inertie → ToolboxSection
- Suppression doublon SectionLayout (common/) — conflit de nommage résolu
- Renommage complet Glibredecision → libreDecision dans configs/docker/CI
- README.md + CONTRIBUTING.md ajoutés

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker/docker-compose.dev.yml

@@ -7,15 +7,15 @@ services:
     image: postgres:16-alpine
     restart: unless-stopped
     environment:
-      POSTGRES_DB: ${POSTGRES_DB:-glibredecision}
-      POSTGRES_USER: ${POSTGRES_USER:-glibredecision}
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-glibredecision-dev}
+      POSTGRES_DB: ${POSTGRES_DB:-libredecision}
+      POSTGRES_USER: ${POSTGRES_USER:-libredecision}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-libredecision-dev}
     ports:
       - "5432:5432"
     volumes:
       - postgres-data:/var/lib/postgresql/data
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-glibredecision}"]
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-libredecision}"]
       interval: 5s
       timeout: 3s
       retries: 10
@@ -34,7 +34,7 @@ services:
     ports:
       - "8002:8002"
     environment:
-      DATABASE_URL: postgresql+asyncpg://${POSTGRES_USER:-glibredecision}:${POSTGRES_PASSWORD:-glibredecision-dev}@postgres:5432/${POSTGRES_DB:-glibredecision}
+      DATABASE_URL: postgresql+asyncpg://${POSTGRES_USER:-libredecision}:${POSTGRES_PASSWORD:-libredecision-dev}@postgres:5432/${POSTGRES_DB:-libredecision}
       SECRET_KEY: dev-secret-key-not-for-production
       DEBUG: "true"
       ENVIRONMENT: development