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

backend/render.py

@@ -14,7 +14,7 @@ from playwright.async_api import async_playwright
 
 from config import config
 from fonts import font_face_css
-from integrations import claude_usage, codex, homeassistant, kobo, nas, trackers, weather
+from integrations import claude_usage, codex, kobo, nas, trackers, weather
 
 TEMPLATES = Path(__file__).parent / "templates"
 
@@ -55,10 +55,9 @@ def _gauges(usage: claude_usage.ClaudeUsage) -> list[dict]:
 
 async def build_context() -> dict:
     """Récupère toutes les sources en parallèle et assemble le contexte du template."""
-    usage, wx, ha, nas_status, codex_status, tracker_stats = await asyncio.gather(
+    usage, wx, nas_status, codex_status, tracker_stats = await asyncio.gather(
         claude_usage.fetch_usage(),
         weather.fetch_weather(),
-        homeassistant.fetch_states(),
         nas.fetch_status(),
         codex.fetch_status(),
         trackers.fetch_all(),
@@ -75,7 +74,6 @@ async def build_context() -> dict:
         "weather": wx,
         "claude": usage,
         "gauges": _gauges(usage),
-        "ha_states": ha,
         "nas": nas_status,
         "codex": codex_status,
         "trackers": tracker_stats,