OPT-17 review: title the forecast row on Home; test the hint and blank rows

The new status row's id `solar_forecast` had no Home title, so Home showed
it under the fallback "Inverter connection". Add "Solar forecast" /
"Zonneprognose" to ui_text, and checks for the title, the tomorrow-gap hint
and blank list rows (review mutations R7, R9, R14 now killed).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bdqr7PiaHcBnzPituu2yTC

goodwe_controller/app/ui_text/nl.json

@@ -372,6 +372,7 @@
       "delivery": "Een omvormer levert niet",
       "estop": "Noodstop",
       "pv": "Meting van de zonnepanelen",
+      "solar_forecast": "Zonneprognose",
       "none": "Verbinding met de omvormer"
     },
     "months": ["januari", "februari", "maart", "april", "mei", "juni", "juli", "augustus", "september", "oktober", "november", "december"]