Remove EventValidator

[rfc2822]

Removes EventValidator and moves remaining functionality to where it belongs.

Should clear the way for #82.

Closes #88. Depends on #102.

[github-actions]

This PR/issue depends on:

• Split time builder into start and end time builders #102

[Copilot]

Pull Request Overview

This PR removes the EventValidator class and redistributes its functionality to more appropriate locations within the codebase. The alignment logic for RRULE UNTIL dates now resides in RecurrenceFieldsProcessor, where it's applied during event processing rather than as a separate validation step.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/src/main/kotlin/at/bitfire/ical4android/validation/EventValidator.kt	Removed entire EventValidator class
lib/src/test/kotlin/at/bitfire/ical4android/validation/EventValidatorTest.kt	Removed test file for deleted EventValidator
lib/src/main/kotlin/at/bitfire/synctools/mapping/calendar/processor/RecurrenceFieldsProcessor.kt	Added alignUntil method to handle RRULE UNTIL alignment
lib/src/test/kotlin/at/bitfire/synctools/mapping/calendar/processor/RecurrenceFieldProcessorTest.kt	Added test coverage for new alignUntil method
lib/src/main/kotlin/at/bitfire/ical4android/EventWriter.kt	Removed EventValidator.repair() call
lib/src/main/kotlin/at/bitfire/ical4android/EventReader.kt	Removed EventValidator.repair() call
lib/src/main/kotlin/at/bitfire/synctools/mapping/calendar/builder/EndTimeBuilder.kt	Added cross-reference comment to RecurrenceFieldsProcessor.alignUntil
lib/src/main/kotlin/at/bitfire/synctools/util/AndroidTimeUtils.kt	Improved documentation formatting with markdown code formatting
lib/src/main/kotlin/at/bitfire/synctools/mapping/calendar/processor/DurationProcessor.kt	Fixed toIcal4jDateTime call to include tzRegistry parameter

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