feat(user): wire user delete into UserGetContainer and UserProfileView

[zigzagdev]

Summary

• Note: same deviation as update — no separate delete screen/route; deletion happens from the existing /users/:id page
• UserGetContainer now also drives useDeleteUser; navigates to /heritages once deletion completes (done)
• UserProfileView gains a "Delete User" button that opens a confirmation dialog (MUI Dialog); confirming calls onDelete, cancelling closes it with no side effect; shows an error panel via deleteError on failure
• Add userDeleteButton/userDeleteConfirmTitle/userDeleteConfirmMessage/userDeleteError i18n keys (en/ja)

Related

Closes #426

Test plan

• npx tsc --noEmit
• npx jest src/app/features/user
• npx prettier --check on the touched files

[zigzagdev]

Ok