feat: add Day 6 stretching template to seed defaults

Full-body stretching session (~30 min) covering all major muscle
groups with 15 bodyweight exercises: neck, shoulders, chest, back,
spine, hips, hamstrings, quads, glutes, calves, and arms.
Each exercise has 2 sets of 60-90s holds with 15s rest.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.24.0",
+	"version": "1.24.1",
 	"private": true,
 	"type": "module",
 	"scripts": {