Christoffer Martinsson d4531ef2e8 Hide backup panel when no backup data is present
- Add has_data() method to BackupWidget to check if backup metrics exist
- Modify dashboard layout to conditionally show backup panel only when data exists
- When no backup data: system panel takes full left side height
- When backup data exists: system and backup panels share left side equally

Prevents empty backup panel from taking up screen space unnecessarily.
2025-10-20 13:01:42 +02:00
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