feat(02-02): wire deleteLog through App.jsx and WorkoutPage to ExerciseCard

- Added deleteLog function in App.jsx: calls DELETE /api/logs and removes entry from local logs state
- Passed onDeleteSet={deleteLog} to WorkoutPage in workout view render
- Updated WorkoutPage function signature to accept onDeleteSet prop
- Passed onDeleteSet through to each ExerciseCard (ExerciseCard already calls it in handleDeleteSet)
- Non-logged sets (404 from backend) silently ignored via catch block

frontend/src/pages/WorkoutPage.jsx

@@ -47,7 +47,7 @@ function getMuscleGroups(exercises) {
   return Array.from(groups)
 }
 
-function WorkoutPage({ day, week, logs, onLogSet, onBack, fetchProgression }) {
+function WorkoutPage({ day, week, logs, onLogSet, onDeleteSet, onBack, fetchProgression }) {
   const [progressions, setProgressions] = useState({})
   const [expandedExercise, setExpandedExercise] = useState(null)
   const [warmupDone, setWarmupDone] = useState(false)
@@ -239,6 +239,7 @@ function WorkoutPage({ day, week, logs, onLogSet, onBack, fetchProgression }) {
                 expandedExercise === exercise.id ? null : exercise.id
               )}
               onLogSet={onLogSet}
+              onDeleteSet={onDeleteSet}
             />
           ))}
         </section>