OPT-11 P3 review: sale shows no money, honest sell text, tests for four surviving mutants

- A sale block on the plan no longer says "Worth up to" at the import
  price: a sale earns the lower injection price.
- The selling switch help (EN/NL) and DOCS say the grid pays less than
  power costs; DECISIONS records why P3 loses on the replay.
- test_modes_p3 part 11: modes on ignore the site trade switch (R13), a
  battery in maintenance takes no part (R10), a headroom stop latches for
  the period (R8). All three mutants survived before and are red now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

goodwe_controller/app/ui_text/en.json

@@ -92,7 +92,7 @@
         "off": {"name": "Off", "description": "Rests, and helps only when the peak limit needs it."}
       },
       "today": "Today", "why": "Why",
-      "sell": {"name": "Sell in expensive hours", "description": "Also sells to the grid in the most expensive hours.", "off": "Not for Solar first."},
+      "sell": {"name": "Sell in expensive hours", "description": "Also sells to the grid in the most expensive hours, but you are paid less than you pay for power.", "off": "Not for Solar first."},
       "modes_off": {"name": "Battery modes are off"},
       "how": {"name": "How the modes work", "description": "Which battery gets solar first, and when each gives power.",
         "solar_first": {"description": "Solar first gets spare solar before the other batteries, and covers the house at any hour."},