Description

Fixes two calendar regressions in the custom day view.

When a custom calendar view uses a filtered hour range such as 8-23, timed tasks could be created or rendered at incorrect positions because the visible time grid was still being interpreted against the full 0-24 range. This PR corrects the time-slot mapping and timed event positioning so custom day views display tasks at the expected hours.

This PR also fixes the awkward jump-to-top behavior after task edits or completion toggles in the day/week calendar view by preserving and restoring the time-grid scroll position during refreshes. In addition, it improves timed range resolution so tasks with explicit start/end-like metadata are rendered with the correct duration in calendar views.

Type of Change

• Bug fix
• New feature
• Documentation update
• Code refactoring

Checklist

• I have read and agree to the CLA
• My code follows the project's style guidelines
• I have tested my changes
• I have updated the documentation

Related Issues

Closes #(issue number)