Glow is the default fill for new spaces, and leads the options list

Owner call: 'Свет по источникам' is the mode that sells the card, so a new
space starts with it and the settings dialog offers it first. Deliberately
NOT changed: the fallback for an absent fill_mode stays 'none'
(spaceDisplayOf), so updating the card never repaints an existing plan
whose owner made no choice. smoke_space_settings re-pinned to the new
contract.

demo/smoke_space_settings.mjs

@@ -56,6 +56,8 @@ checkAll(res, {
   "livingStyle": "--room-stroke:#ff8800;--room-stroke-op:0.8;--room-fill:#ffd45c;--room-fill-op:0.180",
   "lqiFills": 0,
   "atticSquare": true,
-  "atticSettings": {"show_borders": true, "show_names": true, "room_color": "#3ea6ff", "room_opacity": 0.55, "fill_mode": "none", "temp_min": 20, "temp_max": 25, "show_lqi": true, "label_temp": false, "label_hum": false, "label_lqi": false, "label_light": false},
+  // fill_mode 'glow' — the default for NEW spaces since v1.54 (owner call).
+  // Existing spaces with an absent fill_mode still resolve to 'none'.
+  "atticSettings": {"show_borders": true, "show_names": true, "room_color": "#3ea6ff", "room_opacity": 0.55, "fill_mode": "glow", "temp_min": 20, "temp_max": 25, "show_lqi": true, "label_temp": false, "label_hum": false, "label_lqi": false, "label_light": false},
 });
 await finish(browser, res);