Add per-exercise personal record tracking

Session tracking only ever stored a done boolean - no record of what
weight or reps were actually performed, so there was no way to derive
real progress data even though the dashboard implied "progress
tracking" was a thing. Workout templates only hold a static planned
value, not a history of performance.

Adds actual_weight/actual_reps to workout_session_items, captured
inline when checking off a set in a session (defaults to the workout's
planned weight/reps, editable before confirming). The exercise detail
page now shows the user's personal best (heaviest completed set, tie
broken by reps) computed from their completed session history across
all workouts containing that exercise.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Http/Controllers/ExerciseController.php

@@ -6,6 +6,7 @@ use App\Models\BodyPart;
 use App\Models\Equipment;
 use App\Models\Exercise;
 use App\Models\Muscle;
+use App\Models\WorkoutSessionItem;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 
@@ -104,9 +105,23 @@ class ExerciseController extends Controller
 
         $similarExercises = $similarQuery->get();
 
+        $personalBest = null;
+        if (Auth::check()) {
+            $personalBest = WorkoutSessionItem::query()
+                ->with('session')
+                ->whereHas('workoutExercise', fn ($q) => $q->where('exercise_id', $exercise->id))
+                ->whereHas('session', fn ($q) => $q->where('user_id', Auth::id()))
+                ->where('done', true)
+                ->whereNotNull('actual_weight')
+                ->orderByDesc('actual_weight')
+                ->orderByDesc('actual_reps')
+                ->first();
+        }
+
         return view('exercises.show', [
             'exercise' => $exercise,
             'similarExercises' => $similarExercises,
+            'personalBest' => $personalBest,
         ]);
     }
 }

app/Http/Controllers/WorkoutSessionController.php

@@ -58,6 +58,11 @@ class WorkoutSessionController extends Controller
             abort(404);
         }
 
+        $data = $request->validate([
+            'actual_weight' => ['nullable', 'numeric', 'min:0', 'max:9999.99'],
+            'actual_reps' => ['nullable', 'integer', 'min:0', 'max:1000'],
+        ]);
+
         $si = WorkoutSessionItem::firstOrCreate([
             'session_id' => $session->id,
             'workout_exercise_id' => $item->id,
@@ -66,6 +71,14 @@ class WorkoutSessionController extends Controller
         ]);
 
         $si->done = !$si->done;
+        if ($si->done) {
+            if (array_key_exists('actual_weight', $data) && $data['actual_weight'] !== null) {
+                $si->actual_weight = $data['actual_weight'];
+            }
+            if (array_key_exists('actual_reps', $data) && $data['actual_reps'] !== null) {
+                $si->actual_reps = $data['actual_reps'];
+            }
+        }
         $si->save();
 
         return back();