feat(insights): first isights impemetation

lib/features/insights/presentation/widgets/insights_tabs.dart

@@ -0,0 +1,80 @@
+import 'package:eatvio_app/features/insights/presentation/cubit/insights_panel.dart';
+import 'package:eatvio_app/features/insights/presentation/widgets/insights_colors.dart';
+import 'package:eatvio_app/generated/l10n.dart';
+import 'package:flutter/material.dart';
+
+extension InsightsPanelLabel on InsightsPanel {
+  String label(S s) {
+    switch (this) {
+      case InsightsPanel.weight:
+        return s.insights_tab_weight;
+      case InsightsPanel.bmi:
+        return s.insights_tab_bmi;
+      case InsightsPanel.measures:
+        return s.insights_tab_measures;
+      case InsightsPanel.daily:
+        return s.insights_tab_daily;
+      case InsightsPanel.intra:
+        return s.insights_tab_intra;
+    }
+  }
+}
+
+/// Горизонтально прокручиваемые вкладки (`l-tab`).
+class InsightsTabs extends StatelessWidget {
+  const InsightsTabs({
+    super.key,
+    required this.panels,
+    required this.selected,
+    required this.onSelected,
+  });
+
+  final List<InsightsPanel> panels;
+  final InsightsPanel selected;
+  final ValueChanged<InsightsPanel> onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    final s = S.of(context);
+    return SingleChildScrollView(
+      scrollDirection: Axis.horizontal,
+      child: Row(
+        children: [
+          for (final panel in panels)
+            InkWell(
+              key: Key('insights_tab_${panel.name}'),
+              onTap: () => onSelected(panel),
+              child: Container(
+                padding: const EdgeInsets.symmetric(
+                  horizontal: 12,
+                  vertical: 10,
+                ),
+                decoration: BoxDecoration(
+                  border: Border(
+                    bottom: BorderSide(
+                      color: panel == selected
+                          ? InsightsColors.blue
+                          : Colors.transparent,
+                      width: 2,
+                    ),
+                  ),
+                ),
+                child: Text(
+                  panel.label(s),
+                  style: TextStyle(
+                    fontSize: 13,
+                    fontWeight: panel == selected
+                        ? FontWeight.w700
+                        : FontWeight.w600,
+                    color: panel == selected
+                        ? InsightsColors.blue
+                        : InsightsColors.subtitle,
+                  ),
+                ),
+              ),
+            ),
+        ],
+      ),
+    );
+  }
+}