UX-08 2d: plain log lines, the rest of the status page, and DOCS

Every WARNING and ERROR line is one plain line of at most 25 words, with
no card ids, capitals or semicolons; the reasoning of the ten longest is
on a DEBUG line. The ux08 allowlist is empty and its cap is 0 (43 -> 0).

The status page: the month-peak and peak-guard rows, the stale-reading
row, the top table (Why, Tariff, Arbitrage, Shadow mode, labels), the
Stopped banner and the line under the buttons, which now shows the plain
hint of each event instead of the raw action log. The Supervisor question
at start logs one line with a real reason.

Refusals are counted as shown (labels expanded, long cases driven), seven
were shortened, the card and parse errors lost their internals, a blank
value reads "empty", and the panel no longer files inverters.max_w under
the flat max_w. Option names lose "(JSON)", the NL texts are checked too.

DOCS gets a glossary (control board, isolator, Developer Tools) and card
ids move from headings to a "For installers" line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyR88rXETvwhTgx6yHE39p

goodwe_controller/app/custom_formula.py

@@ -175,6 +175,8 @@ import math
 from dataclasses import dataclass
 from datetime import date, datetime, timezone
 
+from . import messages
+
 
 class FormulaInvalid(Exception):
     """`price_formula` cannot be used. Raised by the parser, refused by
@@ -285,30 +287,28 @@ _LEGS = {
                  '"offset":1.00,"units":"c_eur_per_kwh","vat_pct":6,'
                  '"card":{"month":"2026-09","index_eur_per_mwh":133.9905,'
                  '"expect_incl_vat":15.55}}'),
-        when=("Leave it empty unless “Dynamic price source” (price_provider) "
-              "is 'custom_formula'."),
+        when="Leave it empty unless “Dynamic price source” is 'custom_formula'.",
         zero_factor=" and trading never finds a price difference",
         flat="use “Fixed or day/night tariff” (static_profile) instead",
         neg_factor="Put the minus sign on the offset, not on the factor",
         card_required=True,
         card_note="The add-on needs it to check your two numbers",
-        card_causes=("that network charges are in “Distribution, levies and VAT” "
-                     "(price_taxes_eur_kwh), not in the offset"),
+        card_causes=("the units, the VAT, and that network charges are not "
+                     "in the offset"),
     ),
     EXPORT_FORMULA_OPTION: _Leg(
         option=EXPORT_FORMULA_OPTION,
         what="injection",
         example=('{"index":"epex_be","resolution":"hourly","factor":0.1,'
                  '"offset":-1.188,"units":"c_eur_per_kwh","vat_pct":0}'),
-        when=("Fill it in only if your injection price follows the market. It "
-              "is used whatever the price source is."),
+        when="Fill it in only if your injection price follows the market.",
         zero_factor="",
         flat="use “Injection price” (export_price_eur_kwh) instead",
         neg_factor="Put the minus sign on the offset, not on the factor",
         card_required=False,
         card_note=("It is optional here. Without it the add-on only checks "
                    "the size of your two numbers"),
-        card_causes="that vat_pct is 0 for injection",
+        card_causes="the units, and that the VAT is 0 for injection",
     ),
 }
 
@@ -527,10 +527,8 @@ def parse_price_formula(value, *, option: str = "price_formula"):
             value = json.loads(text)
         except ValueError as e:
             raise FormulaInvalid(
-                f"{option} is not valid JSON ({e}). Write it on one line, for "
-                f"example\n"
-                f"  {leg.example}\n"
-                f"{leg.when}")
+                f"{messages.not_valid(option, e)}. Copy the example from the "
+                f"documentation. {leg.when}")
     if not isinstance(value, dict):
         raise FormulaInvalid(
             f"{option} is {type(value).__name__}, not a JSON object with "
@@ -685,9 +683,9 @@ def card_refusal(spec: FormulaSpec, delta: float) -> str:
     got = in_card_units(spec, spec.card_index_eur_per_mwh)
     leg = _LEGS[spec.option]
     return (
-        f"{spec.option} does not match its own card: it gives {got:.4f} "
-        f"{spec.units} and the card says {spec.card_expect_incl_vat:g}. Check "
-        f"the units, the VAT and {leg.card_causes}.")
+        f"{spec.option} gives {got:.4f} "
+        f"{messages.UNIT_WORDS.get(spec.units, spec.units)}, the card says "
+        f"{spec.card_expect_incl_vat:g}. Check {leg.card_causes}.")
 
 
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