Фикс вращения вентилятора + разделение сигналов на аналоговые/дискретные

transform-origin: center у SVG-группы лопастей считался от bounding box,
а не от геометрического центра ступицы (0,0) — вентилятор вращался вокруг
смещённой точки. Зафиксировано в 0 0.

Датчик больше не подписан как «DHT22» (сбивало с толку при добавлении
дискретных сигналов вроде door_open) — просто «Датчик», а сами сигналы
в карточке визуально разбиты на группы «Аналоговые»/«Дискретные».

internal/httpserver/web/index.html

@@ -47,7 +47,12 @@
   .peripheral-label { font-size: 12px; fill: var(--text); font-weight: 600; text-anchor: middle; }
   .peripheral-sub { font-size: 9px; fill: var(--muted); text-anchor: middle; }
 
-  .fan-blades { transform-origin: center; transition: opacity .2s; }
+  /* The blade ellipses are laid out so their geometric centroid is the
+     group's local (0,0) — but CSS "transform-origin: center" for SVG uses
+     the bounding box center, which isn't the same point (the ellipses'
+     144x28-ish extents aren't symmetric around 0,0), so it wobbled around
+     an off-center point instead of spinning cleanly. Pin it to 0 0. */
+  .fan-blades { transform-origin: 0px 0px; transition: opacity .2s; }
   .fan-blades.on { animation: spin 0.9s linear infinite; }
   @keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
 
@@ -107,6 +112,12 @@
   .value { color: var(--text); font-weight: 600; }
   .hint { color: var(--muted); font-size: 0.78rem; margin-top: 10px; }
 
+  .signal-group-label {
+    font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.04em;
+    color: var(--muted); margin-top: 12px; margin-bottom: 2px;
+  }
+  .signal-group-label:first-child { margin-top: 0; }
+
   .signal-row {
     display: flex; align-items: center; justify-content: space-between;
     gap: 8px; padding: 6px 0; border-top: 1px solid var(--border); font-size: 0.85rem;
@@ -184,7 +195,7 @@
     <text id="board-sensor-primary" x="0" y="-2" text-anchor="middle" font-size="14" fill="#e6edf5" font-weight="700">24°C</text>
     <text id="board-sensor-secondary" x="0" y="14" text-anchor="middle" font-size="10" fill="#8ea0b8">55%</text>
   </g>
-  <text class="peripheral-label" x="70" y="118">Датчик DHT22</text>
+  <text class="peripheral-label" x="70" y="118">Датчик</text>
   <text class="peripheral-sub" x="70" y="130">GPIO4 · input</text>
 
   <!-- fan (top right) -->
@@ -289,17 +300,12 @@ function cardHTML(slot) {
 
 document.getElementById('cards').innerHTML = Object.keys(SLOTS).map(cardHTML).join('');
 
-function signalRowHTML(slot, name, value) {
+function isDiscreteSignal(slot, name) {
+  return knownSignals[slot]?.discrete?.has(name);
+}
+
+function analogRowHTML(slot, name, value) {
   const preset = SIGNAL_PRESETS[name];
-  const isDiscrete = !preset && (value === 0 || value === 1) && knownSignals[slot]?.discrete?.has(name);
-
-  if (isDiscrete) {
-    return `<div class="signal-row" data-signal="${name}">
-      <span class="name">${name}</span>
-      <div class="toggle ${value ? 'on' : ''}" onclick="toggleDiscrete('${slot}','${name}')"><div class="knob"></div></div>
-    </div>`;
-  }
-
   const min = preset?.min ?? 0, max = preset?.max ?? 100, step = preset?.step ?? 1, unit = preset?.unit ?? '';
   return `<div class="signal-row" data-signal="${name}">
     <span class="name">${name}${unit ? ' ('+unit+')' : ''}</span>
@@ -309,14 +315,37 @@ function signalRowHTML(slot, name, value) {
   </div>`;
 }
 
+function discreteRowHTML(slot, name, value) {
+  return `<div class="signal-row" data-signal="${name}">
+    <span class="name">${name}</span>
+    <div class="toggle ${value ? 'on' : ''}" onclick="toggleDiscrete('${slot}','${name}')"><div class="knob"></div></div>
+  </div>`;
+}
+
 function cssId(name) { return name.replace(/[^a-zA-Z0-9_-]/g, '_'); }
 
+// Discrete vs analog are shown as two visually separate groups — a
+// discrete "door_open" signal is still just another sensor_type on the
+// same physical device underneath (one MQTT device can report several
+// sensor_types, same as real telemetry), but grouping keeps it from
+// reading as "attached to the temperature sensor".
 function renderSignals(slot, readings) {
   const container = document.getElementById(`${slot}-signals`);
-  const names = Object.keys(readings);
-  // Preserve discrete-ness across re-renders (server only stores numbers).
   knownSignals[slot] = knownSignals[slot] || { discrete: new Set() };
-  container.innerHTML = names.map((name) => signalRowHTML(slot, name, readings[name])).join('');
+
+  const analogNames = orderedNames(readings).filter((n) => !isDiscreteSignal(slot, n));
+  const discreteNames = Object.keys(readings).filter((n) => isDiscreteSignal(slot, n)).sort();
+
+  let html = '';
+  if (analogNames.length) {
+    html += `<div class="signal-group-label">Аналоговые</div>`;
+    html += analogNames.map((name) => analogRowHTML(slot, name, readings[name])).join('');
+  }
+  if (discreteNames.length) {
+    html += `<div class="signal-group-label">Дискретные</div>`;
+    html += discreteNames.map((name) => discreteRowHTML(slot, name, readings[name])).join('');
+  }
+  container.innerHTML = html;
   updateBoardText(slot, readings);
 }