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/ui/Slider.tsx

@@ -0,0 +1,50 @@
+"use client";
+
+interface SliderProps {
+  min: number;
+  max: number;
+  value: number;
+  onChange: (value: number) => void;
+  step?: number;
+  label?: string;
+  unit?: string;
+  className?: string;
+}
+
+export function Slider({
+  min,
+  max,
+  value,
+  onChange,
+  step = 1,
+  label,
+  unit,
+  className = "",
+}: SliderProps) {
+  return (
+    <div className={`flex flex-col gap-2 ${className}`}>
+      {(label || unit) && (
+        <div className="flex items-center justify-between">
+          {label && (
+            <label className="text-sm font-medium text-zinc-300">
+              {label}
+            </label>
+          )}
+          <span className="text-sm font-semibold text-accent tabular-nums">
+            {value}
+            {unit && <span className="ml-0.5 text-zinc-400">{unit}</span>}
+          </span>
+        </div>
+      )}
+      <input
+        type="range"
+        min={min}
+        max={max}
+        step={step}
+        value={value}
+        onChange={(e) => onChange(Number(e.target.value))}
+        className="range-slider w-full h-2 rounded-full appearance-none cursor-pointer bg-zinc-700"
+      />
+    </div>
+  );
+}