feat(programmer): dashboard stat tiles + badges

Add StatTiles and BadgesStrip widgets wired into ProgrammerDashboard.

StatTiles shows 2 tiles (focus + completed) when showSheetStats is false,
and 5 tiles (+ streak, first-pass approval, help given) when the viewing
user's role is programmer. BadgesStrip renders earned/locked chips in a
horizontal Wrap with tap-to-dialog detail.

Dashboard feeds todayFocus via buildDayRows/totalSeconds, leaveDays via
approvedLeaveDays, and sheets: const [] until Task 20 wires real data.

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/screens/programmer_tasks/dashboard/badges_strip.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+
+import '../../../theme/app_status_colors.dart';
+import '../../../utils/programmer_stats.dart';
+
+/// A horizontal wrap of badge chips for the programmer dashboard.
+///
+/// Earned badges use the success container colour; locked badges show neutral
+/// styling and display `current/target` as their label. Tapping any chip opens
+/// an [AlertDialog] with the badge title and description.
+class BadgesStrip extends StatelessWidget {
+  const BadgesStrip({
+    super.key,
+    required this.badges,
+  });
+
+  final List<BadgeProgress> badges;
+
+  @override
+  Widget build(BuildContext context) {
+    if (badges.isEmpty) return const SizedBox.shrink();
+    return Wrap(
+      spacing: 8,
+      runSpacing: 8,
+      children: [
+        for (final badge in badges) _BadgeChip(badge: badge),
+      ],
+    );
+  }
+}
+
+class _BadgeChip extends StatelessWidget {
+  const _BadgeChip({required this.badge});
+
+  final BadgeProgress badge;
+
+  @override
+  Widget build(BuildContext context) {
+    final statusColors = AppStatusColors.of(context);
+    final earned = badge.earned;
+
+    return ActionChip(
+      avatar: Icon(badge.icon, size: 16),
+      label: Text(earned ? badge.title : '${badge.current}/${badge.target}'),
+      backgroundColor: earned ? statusColors.success.container : null,
+      onPressed: () {
+        showDialog<void>(
+          context: context,
+          builder: (ctx) => AlertDialog(
+            title: Text(badge.title),
+            content: Text(badge.description),
+          ),
+        );
+      },
+    );
+  }
+}