Page History

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• [ ] Zones calculated to fill the FULL canvas width and height
• [ ] Every zone has a background Rectangle with FillTheme: "PanelBackground"
• [ ] Zone backgrounds are FIRST in the Elements array
• [ ] Symbols are ≥ 80×80 pixels, centered in their zones
• [ ] Zone titles are FontSize ≥ 1514
• [ ] Value text is FontSize ≥ 1412
• [ ] Value and Unit are in the SAME TextBlock (e.g., "Flow: {@Tag.X} GPM")
• [ ] Flow arrows (→) placed between adjacent zones
• [ ] Bottom panel fills remaining vertical space
• [ ] Bottom panel sections have PanelBackground theme Rectangles
• [ ] No element extends beyond the size of display
• [ ] Page navigation is in the Header display, NOT on content pages
• [ ] Display identifier field is Name (not ObjectName)
• [ ] PanelType is set at top level (never inside JsonFormat)

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