UX-13 P1 review: Home draws only what the cycle would do

- Trade blocks: none on a battery with no room, no sale at a negative price
  or while the emptiest battery is at arbitrage's floor, nothing when a
  level is unknown. A give after a charge may use what the charge put in.
- The refusal line names the real reason: prices not published vs gap.
- The plan's peak line uses the guard's ceiling (this month's peak once
  above the cap), as the peak card does.
- House below zero: 0 W inside the idle band, no figure beyond it.
- Price bars are "Low price" / "High price": the add-on trades in one hour.
- Control toggle: one request in flight at a time.
- test_home: the new cases; the house-sign mutation now goes red.

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

goodwe_controller/app/static/app.js

@@ -309,12 +309,18 @@
   /* ---------------- control buttons ---------------- */
   // The action is a toggle, so the page reads the live state first and sends
   // nothing when control is already where the person asked it to be.
+  // One request at a time: a second confirm while the first is in flight
+  // would read the same state and toggle it back.
+  let toggling = false;
   async function setControl(want) {
+    if (toggling) return;
+    toggling = true;
     try {
       const now = await getStatus();
       if (!now.control || now.control.running !== want) await act("auto_toggle");
       toast(want ? t("toast.started") : t("toast.stopped"));
     } catch (e) { toast(t("toast.failed")); }
+    finally { toggling = false; }
     refresh();
   }
   $("#btn-ctl").addEventListener("click", () => {