UX-13 P4 review fixes (PR #146, comment 1887)

R1: first_start also needs a Store created at this boot (Store.fresh), so
    old never-started sites (both TEST-23 add-ons, one in shadow) stay on Home.
R2: a kettle skip after a fall says on the last step that the reading went down.
R3: the shadow switch goes only on the model the wizard posts, never into V.
R4: Home Assistant not answering is red on the last step.
R5: meter + solar + battery below -300 W flags a reversed battery sensor.
R6: the live checks say what to change and where.

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

goodwe_controller/DOCS.md

@@ -3239,9 +3239,9 @@ the last step.
   to 0 W while it restarts, and with "Start in shadow mode" on (the default) it
   stays at 0 W until you turn shadow mode off under Settings.
 
-Setup opens by itself when the page is opened on a new install: control was
-never started or stopped and Setup never finished, or the stored settings name
-no inverter to control. A running site is never sent there. The add-on does
+Setup opens by itself on a new install's first start, until Setup finishes or
+control is started, and whenever the stored settings name no inverter to
+control. A site that already ran before is never sent there. The add-on does
 not start with no power request entity at all, so on a brand-new install fill
 in "Inverter setpoint entity" on the Configuration tab first.