update config, admin-web tooling & relocate agent skills

Update app.json config and add new dependencies in package.json. Update
.gitignore for new patterns. Add timed-exercise editor/list components,
warmup/stretch video migration, and Supabase helpers in admin-web.
Relocate agent skills from .agents/skills/ to .opencode/skills/.

package.json

@@ -53,11 +53,13 @@
     "expo-linear-gradient": "~15.0.8",
     "expo-linking": "~8.0.11",
     "expo-localization": "~17.0.8",
+    "expo-network": "~8.0.8",
     "expo-notifications": "~0.32.16",
     "expo-router": "~6.0.23",
     "expo-sharing": "~14.0.8",
     "expo-splash-screen": "~31.0.13",
     "expo-status-bar": "~3.0.9",
+    "expo-store-review": "~9.0.9",
     "expo-symbols": "~1.0.8",
     "expo-system-ui": "~6.0.9",
     "expo-video": "~3.0.16",