Implement proper stepper idling. Should close #3

web/js/ble.js

@@ -18,6 +18,7 @@
  *   SPD:<n> → set max speed (steps/sec)
  *   ACC:<n> → set acceleration (steps/sec²)
  *   HOME    → zero both steppers
+ *   DISABLE → disable steppers (un-hold)
  *   POS     → request position report
  *
  * Status characteristic (NOTIFY):

web/js/sections/home.js

@@ -15,7 +15,7 @@ const HomeSection = {
       <div class="section-page fade-in">
         <div class="section-header">
           <h2>WijiBoard</h2>
-          <p>WiFi Spirit Board — SCARA arm controller. Select a section from the sidebar to get started.</p>
+          <p>Bluetooth Spirit Board — SCARA arm controller. Select a section from the sidebar to get started.</p>
         </div>
 
         <div class="grid-2" style="margin-bottom:16px">