fix: 🐛 update lastOffset and fix full day event position when fullHea…

[apurva010]

…derTitle is empty

Description

• Update lastScrollOffset value with heightPerMinute and startDuration for setting scroll offset.
• Fix full day events to be display on correct position when fullHeaderTitle is not provided or empty.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

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