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Replace continuous estimated_distance_m-based radius with proximity band snapping (immediate/near/far/unknown → fixed radius ratios of 0.15/0.40/ 0.70/0.90). The proximity_band is computed server-side from rssi_ema which is already smoothed, so it changes infrequently — dots now only move when a device genuinely crosses a band boundary rather than on every RSSI fluctuation. Also removes the client-side EMA and positionCache added in the previous commit, and reverts CSS style.transform back to SVG transform attribute to avoid coordinate-system mismatch when the SVG is displayed at a scaled size. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>