Allow position replay on lost connection

gemini.md

@@ -97,7 +97,7 @@ Name:     WijiBoard
 
 ### Status notifications (firmware → browser)
 
-`P:<s1>,<s2>` — current step positions for motor 1 and 2, sent every 200 ms while moving.
+`P:<s1>,<s2>,[<held>]` — current step positions for motor 1 and 2, sent every 200 ms while moving, or on request. 3rd parameter is 1 if holding, 0 if disabled.
 `SYS:IDLE_TIMEOUT` — Sent when motors are automatically disabled due to 30 mins of inactivity.
 
 ---

index.html

@@ -231,8 +231,9 @@
       }
     });
 
-    BLE.on('connected', () => {
+    BLE.on('connected', async () => {
       btnDisable.style.display = 'inline-flex';
+      await BLE.write('POS').catch(e => console.warn('POS sync failed:', e));
     });
     BLE.on('disconnected', () => {
       btnDisable.style.display = 'none';

src/main.cpp

@@ -220,7 +220,8 @@ void sendPosition() {
   if (!bleConnected || !pStatusChar)
     return;
   String pos = "P:" + String(stepper1.currentPosition()) + "," +
-               String(stepper2.currentPosition());
+               String(stepper2.currentPosition()) + "," +
+               String(motorsDisabled ? 0 : 1);
   pStatusChar->setValue(pos.c_str());
   pStatusChar->notify();
   Serial.printf("[POS] %s\n", pos.c_str());

web/js/motion.js

@@ -15,9 +15,21 @@ let steps2 = 0;
 document.addEventListener('ble:status', (e) => {
   const msg = e.detail;
   if (msg.startsWith('P:')) {
-    const [s1, s2] = msg.slice(2).split(',').map(Number);
-    steps1 = s1;
-    steps2 = s2;
+    const parts = msg.slice(2).split(',');
+    steps1 = Number(parts[0]);
+    steps2 = Number(parts[1]);
+    
+    // parts[2] is the holding status (1 = holding, 0 = disabled)
+    if (parts.length > 2) {
+      const isHolding = parts[2] === '1';
+      if (!isHolding && localStorage.getItem('wiji_homed') === 'true') {
+        localStorage.setItem('wiji_homed', 'false');
+        UI.log('Steppers are not holding. Rehoming required.', 'warn');
+        document.dispatchEvent(new CustomEvent('wiji:unhomed'));
+        const warningEl = document.getElementById('home-warning');
+        if (warningEl) warningEl.style.display = 'block';
+      }
+    }
   }
 });