Dashboard: trackers en ledger 2 lignes, footer ancré, retrait Home Assistant

- Trackers: I/O + jetons fusionnés sur une ligne (↑↓), ratio en héros (40px)
- Footer: grid-rows minmax(0,1fr) + .pane overflow:hidden -> ne quitte plus le canevas
- Retire la section Maison (HA) du template + le fetch homeassistant de render.py

dev/preview.py

@@ -72,12 +72,6 @@ CTX = {
         {"ok": True, "label": "tr4ker", "ratio_h": "5233,52", "has_io": True, "up_h": "5,62 To", "down_h": "1 Go", "tokens": 223, "tokens_h": "223", "tokens_label": "Crédit"},
         {"ok": True, "label": "yggreborn", "ratio_h": "7,63", "has_io": True, "up_h": "60,55 Go", "down_h": "7,94 Go", "tokens": None},
     ],
-    "ha_states": [
-        {"label": "Salon", "display": "21°"},
-        {"label": "Chambre", "display": "19°"},
-        {"label": "Humidité", "display": "48 %"},
-        {"label": "Porte garage", "display": "Fermée"},
-    ],
     "kobo": {"ok": True, "percent": 63, "charging": False, "low": False, "stale": False},
 }