feat(fitness): auto-advance exercises with view transitions + audio cues

Last set of an exercise auto-advances to the next unfinished exercise.
View Transitions API animates the swap: vertical slide on the exercise
name and set-counter row, horizontal slide on the set table at >=900px.
Three Web Audio cues — per-set tick, exercise-complete two-note rise,
and workout-complete fanfare on the completion overview.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.69.5",
+	"version": "1.70.0",
 	"private": true,
 	"type": "module",
 	"scripts": {