Harden fullcalendar event errors

[jynbil1]

Summary

• replace the fullcalendar sample event endpoint plain-text die path with JSON error responses
• return generic JSON errors for invalid date ranges and timezones
• set JSON content type for both error and success responses, with a focused shell guard

/claim #59

Validation

• sh -n tests/check-fullcalendar-event-errors.sh
• sh tests/check-fullcalendar-event-errors.sh
• git diff --check
• PHP lint not run: php is not installed in this environment

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