OPT-11 P4 review: Cheap hours ignores the plan; midnight-stale forecast; stricter ids

- Cheap hours only fills to the ceiling with or without a forecast, as the
  design (section 1) says. Skipping the sun's share cost 0.31 EUR on real
  2026 prices (29.72 against P3's 29.41) and saved nothing on the P3 set.
- A forecast reading from before local midnight is stale: until the
  integration refreshes, "left today" is still yesterday's 0 and
  "tomorrow" is really today.
- Forecast entity ids must be sensor.[a-z0-9_]+ (they go into the
  /api/states/<id> path).
- House profile: a stored day that is not a date, or is after today, is
  dropped instead of kept forever.
- Text: the forecast line says "for the rest of today"; the learning line
  no longer promises "tomorrow" (a plan needs one full day).
- Tests for four surviving review mutants (hour sample floor, the dear run
  after the cheap run, share by room, daytime use) and the fixes above.
- Replay tool: `--fc zero` (a forecast of no sun).

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

goodwe_controller/app/ui_text/en.json

@@ -339,7 +339,7 @@
       "tops_up": "Too little sun is forecast, so it charges some from the grid.",
       "no_forecast": "No solar forecast, so it charges from solar only."
     },
-    "solar": {"line": "Solar forecast today: {kwh}, we count on {count}. Updated {at}.", "no_forecast": "No solar forecast now, so Leftover solar charges from solar only.", "learning": "The add-on is learning your house's use. The plan starts tomorrow."},
+    "solar": {"line": "Solar forecast for the rest of today: {kwh}, we count on {count}. Updated {at}.", "no_forecast": "No solar forecast now, so Leftover solar charges from solar only.", "learning": "The add-on is learning your house's use. The plan starts after one full day."},
     "today": {
       "not_planned": "Not planned yet.",
       "no_runs": "No cheap or expensive hours left today.",