Bundle size docs explain App Store Connect comparison

The bundle insights documentation now includes an “Understanding bundle sizes” section that clarifies the difference between install size and download size, how values are stored in bytes and shown as decimal MB, and why Tuist’s numbers may differ from App Store Connect. It explains that Tuist measures the unthinned bundle, which corresponds to App Store Connect’s Universal row, while per-device rows are smaller due to app thinning and Apple’s post-upload encryption can make App Store Connect’s download size larger.