Previously, the event title header text in the details popover was being ellipsized(truncated) instead of wrapping, making it difficult to read longer titles.
This commit updates the gcal-event-popover.ui file to set the "wrap" and "wrap-mode" properties to "true" and "word-char", respectively, for the summary label object.
This ensures that the event title header text is wrapped and more readable in the summary popover.
Fixes#1016.
