Fix queue loading, null-safe models, autofill, and add outbound dialer

- Fix queue queries in mobile API and SSE to use twp_group_members
  (matching browser phone) instead of twp_queue_assignments
- Auto-create personal queues if user has no extension
- Make all model JSON parsing null-safe (handle null, string ints, bools)
- Add AutofillGroup and autofill hints to login form
- Add outbound calling with dialpad bottom sheet on dashboard

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mobile/lib/screens/dashboard_screen.dart

@@ -3,6 +3,7 @@ import 'package:provider/provider.dart';
 import '../providers/agent_provider.dart';
 import '../providers/call_provider.dart';
 import '../widgets/agent_status_toggle.dart';
+import '../widgets/dialpad.dart';
 import '../widgets/queue_card.dart';
 import 'active_call_screen.dart';
 import 'settings_screen.dart';
@@ -23,6 +24,90 @@ class _DashboardScreenState extends State<DashboardScreen> {
     });
   }
 
+  void _showDialer(BuildContext context) {
+    final numberController = TextEditingController();
+
+    showModalBottomSheet(
+      context: context,
+      isScrollControlled: true,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
+      ),
+      builder: (ctx) {
+        return Padding(
+          padding: EdgeInsets.only(
+            bottom: MediaQuery.of(ctx).viewInsets.bottom,
+            top: 16,
+            left: 16,
+            right: 16,
+          ),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              // Number display
+              TextField(
+                controller: numberController,
+                keyboardType: TextInputType.phone,
+                autofillHints: const [AutofillHints.telephoneNumber],
+                textAlign: TextAlign.center,
+                style: Theme.of(ctx).textTheme.headlineSmall,
+                decoration: InputDecoration(
+                  hintText: 'Enter phone number',
+                  suffixIcon: IconButton(
+                    icon: const Icon(Icons.backspace_outlined),
+                    onPressed: () {
+                      final text = numberController.text;
+                      if (text.isNotEmpty) {
+                        numberController.text =
+                            text.substring(0, text.length - 1);
+                        numberController.selection = TextSelection.fromPosition(
+                          TextPosition(offset: numberController.text.length),
+                        );
+                      }
+                    },
+                  ),
+                ),
+              ),
+              const SizedBox(height: 16),
+              // Dialpad
+              Dialpad(
+                onDigit: (digit) {
+                  numberController.text += digit;
+                  numberController.selection = TextSelection.fromPosition(
+                    TextPosition(offset: numberController.text.length),
+                  );
+                },
+                onClose: () => Navigator.pop(ctx),
+              ),
+              const SizedBox(height: 8),
+              // Call button
+              ElevatedButton.icon(
+                style: ElevatedButton.styleFrom(
+                  backgroundColor: Colors.green,
+                  foregroundColor: Colors.white,
+                  minimumSize: const Size(double.infinity, 48),
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(24),
+                  ),
+                ),
+                icon: const Icon(Icons.call),
+                label: const Text('Call'),
+                onPressed: () {
+                  final number = numberController.text.trim();
+                  if (number.isNotEmpty) {
+                    context.read<CallProvider>().makeCall(number);
+                    Navigator.pop(ctx);
+                  }
+                },
+              ),
+              const SizedBox(height: 16),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     final agent = context.watch<AgentProvider>();
@@ -58,6 +143,10 @@ class _DashboardScreenState extends State<DashboardScreen> {
           ),
         ],
       ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () => _showDialer(context),
+        child: const Icon(Icons.phone),
+      ),
       body: RefreshIndicator(
         onRefresh: () => agent.refresh(),
         child: ListView(