[scheduler] Wrong vertical alignment for the recurring icon (time grid - 30 min event)

[rita-codes]

Add a dataset with edge cases: 15min, 30min, 45min, etc.

Extra: create a private page (page linked nowhere for now) with a dataset tailored for different durations (at 5, 15, 30min event etc...)

[linear]

X-4523

[github-actions]

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