Overview: Historical toggle with activity heatmap #236
Description
Add UI toggle (top-right) switching from real-time to historical. Historical mode shows device-by-time heatmap (% activity per 10-min bin, color-scaled 0-100).
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Add UI toggle (top-right) switching from real-time to historical. Historical mode shows device-by-time heatmap (% activity per 10-min bin, color-scaled 0-100).