UX-08 2c review: unit settings anchor to inverters, plainer texts

- messages.setting() for one inverter in the list reads
  “Inverter rating” for inverter-b (inverters.max_w), so the config panel
  files per-unit reasons under `inverters`, where the value is changed.
- The tariff card and plausibility reasons name
  “Distribution, levies and VAT” (price_taxes_eur_kwh) again.
- The wrong-direction reasons say "safety stop", the sign_disagree_w
  option says what it protects, and the roster, price-entity,
  integrator_max_w and capacity_kwh texts read more plainly.
- NL: stuurprint -> stuurmodule, "De piekbeperking".

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

goodwe_controller/DOCS.md

@@ -151,7 +151,7 @@ The label and description each setting shows on the Configuration tab, in tab or
 | Hardware · Inverter list | Battery level entity (%) (optional) | `inverters.soc_entity` | This battery's own level sensor. Leave it empty if this inverter has none. |
 | Hardware · Inverter list | Battery power entity (W) (optional) | `inverters.batt_entity` | This inverter's own battery power sensor. Leave it empty if it has none. |
 | Hardware · Inverter list | Battery power sign is reversed (optional) | `inverters.batt_invert` | Switch this on if this inverter's sensor shows giving power as a negative number. |
-| Hardware · Inverter list | Usable battery capacity (kWh) (optional) | `inverters.capacity_kwh` | This battery's usable capacity from its datasheet. Fill it in on every inverter or on none, and the work is then shared by energy left. |
+| Hardware · Inverter list | Usable battery capacity (kWh) (optional) | `inverters.capacity_kwh` | This battery's usable capacity from its datasheet. Fill it in on every inverter or on none. The add-on then shares the work by the energy each battery has left. |
 | Hardware | RS485 emergency stop is fitted | `estop_fitted` | Switch this on if the emergency stop is installed. It only changes a warning on the status page. |
 | Hardware | Solar production entity (W) | `pv_entity` | Optional. Your solar inverter's power sensor, positive while producing. The add-on records it and does not use it for control. |
 | Hardware | Solar production entities, per inverter (W) | `pv_entities` | Optional. Use one row per solar inverter instead of “Solar production entity” when you have several. If one stops reporting, no total is recorded. |
@@ -201,7 +201,7 @@ The label and description each setting shows on the Configuration tab, in tab or
 | Maintenance | Draw down to (%) | `maintenance_soc_floor` | The level the monthly cycle empties the battery to. It is not the “Peak reserve”, and the two differ on purpose. |
 | Maintenance | Recharge up to (%) | `maintenance_soc_target` | The level the recharge aims for before the hold starts. |
 | Maintenance | Hold at full for (minutes) | `maintenance_hold_min` | How long the battery stays full so its cells can balance. |
-| Safety | Wrong-direction threshold (W) | `sign_disagree_w` | A wrong direction counts only when the command and the meter reading both exceed this. Measured value, leave it unchanged. |
+| Safety | Wrong-direction threshold (W) | `sign_disagree_w` | Part of the safety stop for an inverter pushing the wrong way. It counts only when command and meter reading both exceed this. Measured value, leave it unchanged. |
 | Safety | Wrong-direction time (s) | `sign_disagree_s` | How long a wrong direction may last before a safety stop sets every inverter to 0 W. Measured value, leave it unchanged. |
 | Safety | Per-inverter wrong-direction threshold (W) | `unit_sign_disagree_w` | For two or more inverters: the wrong-direction threshold for each inverter. Derived value, leave it unchanged. |
 | Safety | Per-inverter wrong-direction time (s) | `unit_sign_disagree_s` | For two or more inverters: how long one inverter may push the wrong way before it is set to 0 W. Derived value, leave it unchanged. |
@@ -220,7 +220,7 @@ The label and description each setting shows on the Configuration tab, in tab or
 | Advanced | Command rounding (W) | `step_w` | The command is rounded to a multiple of this, so noise does not change it every cycle. |
 | Advanced | Inverter at limit gap (W) | `saturation_w` | When an inverter delivers this much less than asked, it counts as at its limit. The per-inverter wrong-direction threshold is half of this. |
 | Advanced | Cycles at limit before freezing | `saturation_cycles` | How many cycles in a row at the limit before control stops building up error. Do not set it to 1. |
-| Advanced | Error build-up limit (W) | `integrator_max_w` | Limits how much old error control can carry, and 0 means “Inverter rating”. Do not raise it above the rating. |
+| Advanced | Error build-up limit (W) | `integrator_max_w` | Caps the error that control saves up from past cycles. 0 means “Inverter rating”. Do not raise it above the rating. |
 | Advanced | Command refresh interval (s) | `heartbeat_s` | How often the command is sent again even when unchanged. Keep it well under the control board's own 30 s limit. |
 | Advanced | Missing inputs time limit (s) | `stale_input_s` | How long inputs may be missing before every inverter is set to 0 W. With a P1 meter it starts after “Reading too old after”. |
 | Advanced | Longest time between cycles (s) | `cycle_floor_s` | A deadline between control cycles that a healthy meter never reaches. Raise it only for a meter slower than about 10 s. |