chore(vendor): the box's flow hero prints a size, never a raw minus

.changeset/flow-size-no-minus.md

@@ -0,0 +1,5 @@
+---
+"ftw-webapp": patch
+---
+
+The vendored flow diagram prints each device's power as a size, with "charging" or "discharging" under a battery, never a minus sign. Home use in the middle keeps its sign for now, and a battery FTW only observes says so under its title. It is the box's own copy, taken again from srcfl/ftw.

src/vendor/ftw/digests.json

@@ -3,7 +3,7 @@
   "control-feedback.js": "389b5f227b7d125fa4138cc9c803660bfcff58e5ba50a18a4384c58704317d4a",
   "ftw-bar-chart.js": "08b61533ed52b0031a39e723278c812b2b27356c1d574b65dfd5603992065d82",
   "ftw-element.js": "7241b586582187cef2d76d3ee11bbc596c4f428cea3a5c8c84227e113aa3c1a0",
-  "ftw-energy-flow.js": "ced3308f92e0d49b41e7af5038a85e0986a0d879febf3b1541385028af5aa693",
+  "ftw-energy-flow.js": "ef5ca158df1397a776d75b0ba94807c1992fe55aa6763cda0a72458bf643cd8e",
   "ftw-price-chart.js": "1833d8008f06f2eb8f6e2b9b0bb6ff91aafa1f54b81ed249d57bb4fda968a736",
   "price-math.js": "bc6b104259f76d799c0a9d7f1d8a780d897cb7dc0d7a3e16a6572fb9c626d508",
   "price-strip.js": "413b2946c311e910c9a052a8407a3a403ed6caca0e210307c6f3e951896c2b9b",

src/vendor/ftw/ftw-energy-flow.js

@@ -1,4 +1,4 @@
-// Vendored from srcfl/ftw web/components/ftw-energy-flow.js at 6d8e8704ccc8ee801fce16efd717a596e39e76ad.
+// Vendored from srcfl/ftw web/components/ftw-energy-flow.js at cd68b44947322eb1da3b0a86310e15b5121896a3.
 // Do not edit here; change the box source, then copy it here.
 //
 // <ftw-energy-flow> — hero diagram for /next.
@@ -656,12 +656,21 @@ class FtwEnergyFlow extends FtwElement {
         !p.aggregated &&
         (layerClass === "ind" || aggregateMemberCount > 1) &&
         Math.max(p._groupSize || 1, aggregateMemberCount || 1) > 1;
+      const grouped = p._groupSize > 1 && !!p.name;
       return renderCircleNode({
         pos: p._pos,
-        value: p.placeholder ? "—" : fmtKw(p.kw),
+        // A planet prints its size; the word under it gives the direction,
+        // because the UI never shows a raw minus. The hub keeps Core's sign
+        // for Home use (#1768).
+        value: p.placeholder ? "—" : fmtKw(Math.abs(p.kw)),
         title: p.title,
-        nameLabel: p._groupSize > 1 && p.name ? p.name.toUpperCase() : null,
-        sub: p.sub,
+        // The title's second line names the device in a group, or says
+        // that FTW only observes it; a phone's larger title font has room
+        // for one word. A grouped device keeps its name there and says
+        // "observe only" under the size instead.
+        nameLabel: grouped ? p.name.toUpperCase()
+          : p.observeOnly ? (this._compact ? "OBSERVED" : "OBSERVE ONLY") : null,
+        sub: grouped && p.observeOnly ? "observe only" : p.sub,
         color: p.color,
         soc: p.placeholder ? null : p.soc,
         chargeLimit: p.placeholder ? null : p.chargeLimit,
@@ -1665,8 +1674,9 @@ function renderDailyParts(parts) {
 }
 
 function fmtKw(kw) {
-  // Input is kilowatts. Sub-kW values render as plain integer watts
-  // (no decimals) so a "30 W" import or "−12 W" battery trickle stays
+  // Input is kilowatts: a size for a planet, Home use as Core signs it
+  // for the hub. Sub-kW values render as plain integer watts (no
+  // decimals) so a "30 W" import or "12 W" battery trickle stays
   // visible as the real number. The visual "idle / balanced"
   // affordances (beam dimming, sub-label text) live on a separate
   // ±FLOW_IDLE_W threshold; this formatter only handles display.