feat(bt): update service to support interactive pairing process

Services/Networking/BluetoothService.qml

@@ -516,6 +516,48 @@ Singleton {
     }
   }
 
+  // Interaction state
+  property bool pinRequired: false
+  
+  function submitPin(pin) {
+    if (pairingProcess.running) {
+      pairingProcess.write(pin + "\n");
+      root.pinRequired = false;
+    }
+  }
+
+  function cancelPairing() {
+    if (pairingProcess.running) {
+      pairingProcess.kill();
+    }
+    root.pinRequired = false;
+  }
+
+  // Interactive pairing process
+  Process {
+    id: pairingProcess
+    stdout: SplitParser {
+      onRead: data => {
+        var chunk = data; 
+        if (chunk.indexOf("[PIN_REQ]") !== -1) {
+          root.pinRequired = true;
+          Logger.i("Bluetooth", "PIN required for pairing");
+          ToastService.showNotice(I18n.tr("common.bluetooth"), I18n.tr("bluetooth.panel.pin-required"), "lock");
+        }
+      }
+    }
+    stderr: StdioCollector {}
+    onExited: {
+      root.pinRequired = false;
+      Logger.i("Bluetooth", "Pairing process exited.");
+      // Restore discovery if we paused it
+      if (root._discoveryWasRunning) {
+        root.setScanActive(true, 0);
+      }
+      root._discoveryWasRunning = false;
+    }
+  }
+
   // Pair using bluetoothctl which registers its own BlueZ agent internally.
   function pairWithBluetoothctl(device) {
     if (!device) {
@@ -528,6 +570,12 @@ Singleton {
     }
 
     Logger.i("Bluetooth", "pairWithBluetoothctl", addr);
+    
+    // Stop any previous pairing attempt
+    if (pairingProcess.running) {
+      pairingProcess.kill();
+    }
+    root.pinRequired = false;
 
     // Compute bounded waits from tunables
     const pairWait = Math.max(5, Number(root.pairWaitSeconds) | 0);
@@ -539,10 +587,10 @@ Singleton {
     const totalPauseMs = (pairWait * 1000) + (attempts * intervalSec * 1000) + 2000;
     _pauseDiscoveryFor(totalPauseMs);
 
-    // Prefer external dev script for pairing/connecting; executed detached
     const scriptPath = Quickshell.shellDir + "/Bin/bluetooth-connect.py";
-    // Use python3 explicitly
-    btExec(["python3", scriptPath, String(addr), String(pairWait), String(attempts), String(intervalSec)]);
+    
+    pairingProcess.command = ["python3", scriptPath, String(addr), String(pairWait), String(attempts), String(intervalSec)];
+    pairingProcess.running = true;
   }
 
   // Helper to run bluetoothctl and scripts with consistent error logging