workout generator audit: rules engine, structure rules, split patterns, injury UX, metadata cleanup

- Add rules_engine.py with quantitative rules for all 8 workout types
- Add quality gate retry loop in generate_single_workout()
- Expand calibrate_structure_rules to all 120 combinations (8 types × 5 goals × 3 sections)
- Wire WeeklySplitPattern DB records into _pick_weekly_split()
- Enforce movement patterns from WorkoutStructureRule in exercise selection
- Add straight-set strength support (single main lift, 4-6 rounds)
- Add modality consistency check for duration-dominant workout types
- Add InjuryStep component to onboarding and preferences
- Add sibling exercise exclusion in regenerate and preview_day endpoints
- Display generator warnings on dashboard
- Expand fix_rep_durations, fix_exercise_flags, fix_movement_pattern_typo
- Add audit_exercise_data and check_rules_drift management commands
- Add Next.js frontend with dashboard, onboarding, preferences, history pages
- Add generator app with ML-powered workout generation pipeline
- 96 new tests across 7 test modules

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

werkout-frontend/components/plans/WeekPicker.tsx

@@ -0,0 +1,73 @@
+"use client";
+
+interface WeekPickerProps {
+  selectedMonday: string;
+  onChange: (monday: string) => void;
+}
+
+function getMondayDate(dateStr: string): Date {
+  const [y, m, d] = dateStr.split("-").map(Number);
+  return new Date(y, m - 1, d);
+}
+
+function formatDate(date: Date): string {
+  const yyyy = date.getFullYear();
+  const mm = String(date.getMonth() + 1).padStart(2, "0");
+  const dd = String(date.getDate()).padStart(2, "0");
+  return `${yyyy}-${mm}-${dd}`;
+}
+
+function formatWeekLabel(dateStr: string): string {
+  const date = getMondayDate(dateStr);
+  return date.toLocaleDateString("en-US", {
+    month: "short",
+    day: "numeric",
+    year: "numeric",
+  });
+}
+
+function ChevronLeft() {
+  return (
+    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+      <path d="M15 18l-6-6 6-6" />
+    </svg>
+  );
+}
+
+function ChevronRight() {
+  return (
+    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+      <path d="M9 18l6-6-6-6" />
+    </svg>
+  );
+}
+
+export function WeekPicker({ selectedMonday, onChange }: WeekPickerProps) {
+  const shiftWeek = (offset: number) => {
+    const date = getMondayDate(selectedMonday);
+    date.setDate(date.getDate() + offset * 7);
+    onChange(formatDate(date));
+  };
+
+  return (
+    <div className="flex items-center gap-3">
+      <button
+        onClick={() => shiftWeek(-1)}
+        className="p-1.5 rounded-lg text-zinc-400 hover:text-zinc-100 hover:bg-zinc-800 transition-colors"
+        aria-label="Previous week"
+      >
+        <ChevronLeft />
+      </button>
+      <span className="text-sm font-medium text-zinc-200 min-w-[160px] text-center">
+        Week of {formatWeekLabel(selectedMonday)}
+      </span>
+      <button
+        onClick={() => shiftWeek(1)}
+        className="p-1.5 rounded-lg text-zinc-400 hover:text-zinc-100 hover:bg-zinc-800 transition-colors"
+        aria-label="Next week"
+      >
+        <ChevronRight />
+      </button>
+    </div>
+  );
+}