fix+ux v1.15.1: display-settings round from live usage

- comfort bounds: parseFloat+isFinite guard (empty input collapsed a bound to 0
  and the auto-swap made 'comfort from 25' behave as 0-25 → green at 24°)
- avg room temperature in the room tooltip (what the temp fill actually uses)
- hover darkens the current fill instead of recoloring blue; grey when unfilled
- fill mode as a radio group with short labels; compact inline bounds inputs
- space dialog widened to 500px; TESTING.md updated in the same commit

src/i18n/en.json

@@ -159,15 +159,16 @@
   "space.opacity": "Opacity",
   "space.fill_label": "Room fill",
   "fill.none": "None",
-  "fill.lqi": "Zigbee signal (red → green)",
-  "fill.light": "Lights (yellow = on, grey = off)",
+  "fill.lqi": "Zigbee signal",
+  "fill.light": "Lights",
   "space.source_file": "I have a floor-plan image",
   "space.source_draw": "No image — I'll outline rooms by hand",
   "space.orientation": "Canvas",
   "orient.landscape": "Landscape",
   "orient.portrait": "Portrait",
   "orient.square": "Square",
-  "fill.temp": "Temperature (blue = cold, green = comfy, yellow = hot)",
+  "fill.temp": "Temperature",
   "space.temp_min": "Comfort from",
-  "space.temp_max": "to"
+  "space.temp_max": "to",
+  "tip.temp_avg": "average temperature:"
 }

src/i18n/ru.json

@@ -159,15 +159,16 @@
   "space.opacity": "Прозрачность",
   "space.fill_label": "Заливка комнат",
   "fill.none": "Нет",
-  "fill.lqi": "По силе зигби-сигнала (красный → зелёный)",
-  "fill.light": "По освещению (жёлтая = включено, серая = выключено)",
+  "fill.lqi": "По силе зигби-сигнала",
+  "fill.light": "По освещению",
   "space.source_file": "У меня есть картинка плана",
   "space.source_draw": "Нет подложки — нарисую комнаты вручную",
   "space.orientation": "Холст",
   "orient.landscape": "Альбомный",
   "orient.portrait": "Портретный",
   "orient.square": "Квадрат",
-  "fill.temp": "По температуре (голубая = холодно, зелёная = комфорт, жёлтая = жарко)",
+  "fill.temp": "По температуре",
   "space.temp_min": "Комфорт от",
-  "space.temp_max": "до"
+  "space.temp_max": "до",
+  "tip.temp_avg": "средняя температура:"
 }