CreateNestViewModel is keyed by user pubkey via `viewModel(key = …)`,
so the same instance survives across sheet open/close cycles. After a
successful publish the form was left untouched: room name, summary,
image URL stayed populated and — most visibly — `isPublishing` was
never cleared, so on the second open the Submit button rendered as a
spinning progress indicator forever.
Reset the form to fresh defaults (re-seeded from the user's saved
kind-10112 list) at the end of `publishAndBuildLaunchInfo()`, right
before returning the launch info. The sheet is about to dismiss
anyway, so the user never sees the in-place reset; the next open
behaves like a first open.
Claude
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