[Gobidev]

summary/location/description are truncated to 250 bytes with substr(), which can split a multibyte character and leave invalid UTF-8 in the generated event. The event then never imports: the insert into oc_calendarobjects_props fails and it's retried on every sync (MariaDB shows Incorrect string value: '\xC3', PostgreSQL invalid byte sequence). Switch those three fields to mb_strcut(), which keeps the 250-byte limit but cuts at character boundaries. Same fix as MarcelRobitaille#59. Already verified there on Nextcloud 35.0.1.

[github-actions]

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[lukasdotcom]

Thanks @Gobidev for the pr.