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/DECISIONS/OPT-17-several-forecast-entities.md

@@ -47,8 +47,9 @@ day can list them.
    gather that reads the inverters, so a slow sensor does not delay control.
 7. **Shown and logged once.** With two or more members, each one not usable
    is named on the status page by its place in the list (STYLE.md: no entity
-   ids on the page), as a caution row. The action log names the entity id,
-   once when the set of failing members changes.
+   ids on the page), as a caution row titled "Solar forecast" on Home. The
+   action log names the entity id, once when the set of failing members
+   changes.
 8. **One member is the single key.** A one-member list reads, plans, shows
    and logs exactly as the single key with that entity.