The detail that supports the idea that Anne's voice is bright and spirited is the statement: "We're going to buy lots of games."
This statement suggests enthusiasm, optimism, and a lively attitude, which aligns with the qualities of a bright and spirited voice. The other statements either relate to practical activities (cooking and canning) or express restrictions (not being able to look out the window or go outside), which do not convey the same sense of energy and excitement.
In summary, the statement "We're going to buy lots of games" is the one that supports the notion of Anne's voice being bright and spirited because it reflects a positive and enthusiastic attitude towards leisure and enjoyment.