Planner: Smart backgrounds for basic plans

🚨 The Signal: Planner now allows smart backgrounds for basic plans, a cosmetic feature from the legacy experience. This change is purely aesthetic and has no security implications.

The Impact

No security impact. This is a cosmetic feature for end-users with no associated security risks.

• End-users: Can customize Planner backgrounds for visual preference.
• Admins: No administrative action or security risk.
• Security Team: No security implications or required review.

Domain: Other · Impact: low · Workload: Other