Refactor: Implement multi-item inventory for Pad Tracker and dynamic navigation

lib/widgets/pad_tracker_card.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:google_fonts/google_fonts.dart';
+import '../theme/app_theme.dart';
+import '../providers/user_provider.dart';
+import '../screens/log/pad_tracker_screen.dart';
+
+class PadTrackerCard extends ConsumerWidget {
+  const PadTrackerCard({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final user = ref.watch(userProfileProvider);
+    if (user == null || !user.isPadTrackingEnabled) return const SizedBox.shrink();
+
+    return GestureDetector(
+      onTap: () {
+        Navigator.push(
+          context,
+          MaterialPageRoute(builder: (context) => const PadTrackerScreen()),
+        );
+      },
+      child: Container(
+        padding: const EdgeInsets.all(16),
+        decoration: BoxDecoration(
+          color: AppColors.menstrualPhase.withOpacity(0.1),
+          borderRadius: BorderRadius.circular(16),
+          border: Border.all(color: AppColors.menstrualPhase.withOpacity(0.3)),
+          boxShadow: [
+             BoxShadow(
+              color: AppColors.menstrualPhase.withOpacity(0.05),
+              blurRadius: 8,
+              offset: const Offset(0, 4),
+            ),
+          ],
+        ),
+        child: Row(
+          children: [
+            Container(
+              padding: const EdgeInsets.all(10),
+              decoration: BoxDecoration(
+                color: AppColors.menstrualPhase.withOpacity(0.2),
+                shape: BoxShape.circle,
+              ),
+              child: const Icon(Icons.timer_outlined, color: AppColors.menstrualPhase, size: 24),
+            ),
+            const SizedBox(width: 16),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    'Pad Tracker',
+                    style: GoogleFonts.outfit(
+                      fontSize: 16,
+                      fontWeight: FontWeight.w600,
+                      color: AppColors.charcoal,
+                    ),
+                  ),
+                  const SizedBox(height: 4),
+                  if (user.lastPadChangeTime != null)
+                     Text(
+                      'Tap to update',
+                      style: GoogleFonts.outfit(fontSize: 12, color: AppColors.warmGray),
+                     )
+                  else
+                     Text(
+                      'Track your change',
+                      style: GoogleFonts.outfit(fontSize: 12, color: AppColors.warmGray),
+                     ),
+                ],
+              ),
+            ),
+            const Icon(Icons.chevron_right, color: AppColors.menstrualPhase),
+          ],
+        ),
+      ),
+    );
+  }
+}