Next refactors

lib/presentation/chat/widgets/missing_models_state.dart

@@ -0,0 +1,115 @@
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+import 'package:trainhub_flutter/core/constants/ui_constants.dart';
+import 'package:trainhub_flutter/core/router/app_router.dart';
+import 'package:trainhub_flutter/core/theme/app_colors.dart';
+
+class MissingModelsState extends StatelessWidget {
+  const MissingModelsState({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Container(
+            width: 72,
+            height: 72,
+            decoration: BoxDecoration(
+              color: AppColors.surfaceContainerHigh,
+              borderRadius: BorderRadius.circular(18),
+            ),
+            child: const Icon(
+              Icons.cloud_download_outlined,
+              size: 36,
+              color: AppColors.textMuted,
+            ),
+          ),
+          const SizedBox(height: UIConstants.spacing24),
+          Text(
+            'AI models are missing.',
+            style: GoogleFonts.inter(
+              fontSize: 18,
+              fontWeight: FontWeight.w600,
+              color: AppColors.textPrimary,
+              letterSpacing: -0.2,
+            ),
+          ),
+          const SizedBox(height: UIConstants.spacing8),
+          Text(
+            'Please download them to use the AI chat.',
+            style: GoogleFonts.inter(
+              fontSize: 14,
+              color: AppColors.textSecondary,
+            ),
+          ),
+          const SizedBox(height: UIConstants.spacing32),
+          const _GoToSettingsButton(),
+        ],
+      ),
+    );
+  }
+}
+
+class _GoToSettingsButton extends StatefulWidget {
+  const _GoToSettingsButton();
+
+  @override
+  State<_GoToSettingsButton> createState() => _GoToSettingsButtonState();
+}
+
+class _GoToSettingsButtonState extends State<_GoToSettingsButton> {
+  bool _isHovered = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return MouseRegion(
+      onEnter: (_) => setState(() => _isHovered = true),
+      onExit: (_) => setState(() => _isHovered = false),
+      child: AnimatedContainer(
+        duration: UIConstants.animationDuration,
+        height: 44,
+        decoration: BoxDecoration(
+          color: _isHovered
+              ? AppColors.accent.withValues(alpha: 0.85)
+              : AppColors.accent,
+          borderRadius: BorderRadius.circular(UIConstants.smallBorderRadius),
+        ),
+        child: Material(
+          color: Colors.transparent,
+          child: InkWell(
+            borderRadius:
+                BorderRadius.circular(UIConstants.smallBorderRadius),
+            onTap: () => context.router.push(const SettingsRoute()),
+            child: Padding(
+              padding: const EdgeInsets.symmetric(
+                horizontal: UIConstants.spacing24,
+              ),
+              child: Row(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  const Icon(
+                    Icons.settings_outlined,
+                    size: 16,
+                    color: AppColors.zinc950,
+                  ),
+                  const SizedBox(width: UIConstants.spacing8),
+                  Text(
+                    'Go to Settings',
+                    style: GoogleFonts.inter(
+                      fontSize: 14,
+                      fontWeight: FontWeight.w600,
+                      color: AppColors.zinc950,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}