feat(04-04-visual-distinction): Add custom vs program workout badges on WorkoutSelectPage

- Fetch custom workouts for authenticated user
- Display 'Anpassad' (custom) or 'Program' badge on each workout card
- Add badge component with orange accent for custom, muted color for program
- Badge positioned bottom-right of workout icon
- Responsive styling consistent with Gravl dark theme
- All build checks pass

frontend/src/App.css

@@ -2958,3 +2958,43 @@
   border: 2px solid var(--border); display: flex; align-items: center; justify-content: center;
 }
 .warmup-item.done .warmup-check { background: var(--success); border-color: var(--success); color: white; }
+
+/* Workout badge styling */
+.workout-badge-container {
+  position: relative;
+  display: flex;
+  align-items: flex-end;
+}
+
+.workout-badge {
+  position: absolute;
+  bottom: -6px;
+  right: -6px;
+  font-size: var(--font-xs);
+  font-weight: 600;
+  padding: var(--space-1) var(--space-2);
+  border-radius: var(--radius-sm);
+  border: 1px solid transparent;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
+  white-space: nowrap;
+  color: white;
+}
+
+.workout-badge.custom {
+  background: var(--accent);
+  color: white;
+  border-color: var(--accent);
+}
+
+.workout-badge.program {
+  background: var(--text-muted);
+  color: white;
+  border-color: var(--text-muted);
+  opacity: 0.7;
+}
+
+.workout-select-card:hover .workout-badge {
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
+}