This fix restores the ability for users to zoom in and out on frontend pages. It improves accessibility and usability for visitors who need larger content or prefer browser zoom controls.

task-2446015

The planning Gantt popover no longer shows the effective hours field, matching the behavior already used in the planning form. This avoids showing unnecessary or inconsistent information to users when reviewing scheduled work.

Before this commit, we hid the effective_hours in the
planning.slot form view but not in the popover in the gantt view.

This commit removes this field displayed in this popover.

task-2448441