Group all type declarations at the top, keep each type's methods with it,
move package-level helpers and static functions to the end of the file.
- connection.go: ClientError methods sit directly under the struct; the
classifyDaemonError / translateShort helpers move to the file end.
- windowmanager.go: the title / retitleAll / hideOtherWindowsLocked /
restoreHiddenWindowsLocked / getScreenBasedOnCursorPosition helpers and the
errorDialogURL / u32ptr static functions move to the file end; u32ptr no
longer splits the const/var block.
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