UX-54: a Forecast tab with the sun, the house and each battery's level, per hour

A new tab beside Home and Batteries for today and tomorrow: the solar
forecast, the solar measured so far, the house's expected use and each
battery's expected level, with the plan's own charge and give blocks under it.

- Blocks are Home's: today's are the plan's `runs`, tomorrow's come from the
  same builders (`homeview.runs_for()`), in the plan lines' words.
- The sun is what solarfc reads; a daily total is spread over the bell and the
  tab says so. The house is HouseProfile.estimator(), as the plan reads it.
- The level is new: `daycurve.curve()` gives each battery the role
  `modetrade.decide()` gives it and moves it hour by hour inside the plan's
  floor and ceiling. It is an estimate and counts on `solar_trust_pct`.
- Built on request (`GET forecast`), no Home Assistant call. Measured solar is
  kept per hour in memory from the reading control already takes.
- A part not known yet is a note: modes off, no forecast, learning, no
  forecast for tomorrow, a monthly cycle, no level, stopped, shadow.

No decision, command, timing or option key changes. Found, not changed:
`dayplan.plan()` over-counts a state-only forecast (DECISIONS/UX-54).

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

goodwe_controller/app/ui_text/en.json

@@ -45,7 +45,7 @@
   },
   "home": {
     "app": {"name": "Battery add-on"},
-    "tabs": {"home": "Home", "batteries": "Batteries", "settings": "Settings", "setup": "Setup", "label": "Screens"},
+    "tabs": {"home": "Home", "batteries": "Batteries", "forecast": "Forecast", "settings": "Settings", "setup": "Setup", "label": "Screens"},
     "now": {"name": "Now", "description": "Updated every 3 seconds.", "solar": "Solar", "house": "House", "grid": "Grid", "batteries": "Batteries"},
     "plan": {
       "name": "Today's plan",
@@ -68,6 +68,24 @@
       "no_prices": {"description": "No prices for today, so the chart shows only the plan."},
       "list": "The plan in words"
     },
+    "forecast": {
+      "name": "Forecast",
+      "day": "Day",
+      "today": "Today",
+      "tomorrow": "Tomorrow",
+      "sun": "Solar and house",
+      "unit": "kWh per hour",
+      "forecast": "Solar forecast",
+      "measured": "Solar measured",
+      "house": "House use",
+      "levels": "Battery level",
+      "table": "Hour by hour",
+      "hour": "Hour",
+      "solar": "Solar",
+      "got": "Measured",
+      "use": "House",
+      "loading": "Loading the forecast."
+    },
     "peak": {"name": "Peak limit", "this_month": "This month's peak", "limit": "Limit", "none": "None recorded yet", "unreadable": "Cannot be read now"},
     "attention": {"name": "Needs attention", "nothing": "Nothing to look at", "to_look": "to look at", "details": "Details", "alarm": "Alarm", "warning": "Warning", "info": "Info"},
     "control": {"name": "Control", "stop": "Stop control", "start": "Start control", "maint_start": "Start a battery cycle now", "maint_abort": "Stop the battery cycle", "docs": "Add-on documentation", "more": "More actions"},
@@ -425,6 +443,21 @@
       "known": "Tomorrow's prices are in.",
       "unknown": "Tomorrow's prices usually arrive after 13:00."
     },
+    "day": {
+      "modes_off": "Battery modes are off. No forecast is read and no level is planned.",
+      "not_set": "No solar forecast is set up. Without one, no battery level is planned.",
+      "no_forecast": "The solar forecast is missing or too old. The levels return when it is back.",
+      "learning": "The add-on is learning your house's use. The levels start after one full day.",
+      "no_tomorrow": "There is no solar forecast for tomorrow yet. The levels stop at sunrise.",
+      "estimate": "The forecast gives one total for the day. The add-on spreads it over the hours.",
+      "trust": "The levels count on {pct} % of the forecast.",
+      "cycle": "{name} does its monthly cycle. Its level is not shown from the start.",
+      "no_level": "{name} has no level reading yet. Its levels are not shown.",
+      "measured_from": "Measured solar is counted from {at}, when the add-on started.",
+      "tomorrow_total": "Solar expected tomorrow: {kwh}, we count on {count}.",
+      "no_blocks": "No charge or give blocks planned.",
+      "ahead": "The add-on plans prices about a day ahead. Blocks for later hours appear as they come near."
+    },
     "region": {
       "preset": "Levies and VAT: {region}, {year} figures.",
       "own": "Levies and VAT: your own figure."