fix: Session auth, sidebar toggle, and dependencies table

- Change session.cookie_samesite from Strict to Lax for Authelia compatibility
- Redesign sidebar toggle with separate collapse/expand buttons
- Add script to create missing ticket_dependencies table
- Add .env.example template
- Add check for missing .env with helpful error message

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,14 @@
+# Tinker Tickets Environment Configuration
+# Copy this file to .env and fill in your values
+
+# Database Configuration
+DB_HOST=10.10.10.50
+DB_USER=tinkertickets
+DB_PASS=your_password_here
+DB_NAME=ticketing_system
+
+# Discord Webhook (optional - for notifications)
+DISCORD_WEBHOOK_URL=
+
+# Timezone (default: America/New_York)
+TIMEZONE=America/New_York