Config and housekeeping cleanup

- .gitignore: add coverage/, .vscode/, .idea/
- .env.example files: add header comments clarifying production vs dev,
  add SMTP vars to server dev template
- Validate SavedView filters on load with safeParse fallback

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

server/.env.example

@@ -1,4 +1,13 @@
+# Development — used with 'npm run dev' (see root .env.example for Docker/production)
 DATABASE_URL="postgresql://postgres:postgres@localhost:5432/ticketing"
 JWT_SECRET="change-this-to-a-long-random-secret"
 CLIENT_URL="http://localhost:5173"
 PORT=3000
+
+# Email notifications (optional) — leave SMTP_HOST empty to disable
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASS=
+SMTP_FROM=noreply@localhost
+SMTP_SECURE=false