feature/group about timelyscrumboard_z HOT 3 OPEN

• have the “Groups” section be similar to the “People” section (checkboxes where you can select multiple groups),
• when you select groups, that filters the list of all people to only the people in the selected groups,
• instead of having an “edit” icon on the groups header, make it so the modal opens when you click a specific group (or an edit icon next to each group name). when someone does this, it would allow editing of that specific group. the edit modal would have 1) the name of the group, 2) a search filter, 3) the list of all people, with the current people in the group selected,
• there will also be an “add group” icon next to the “People” header which creates a group based on the currently selected people. when you click that icon, you could have a little tooltip that opens which allows entering a group name and clicking “Create”,

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BUG:

• The data in Calendar doesn't match the filter
  • Calendar Number is Oversize sometimes
    reason: numGroupToMember was undefined after Select-All (change array to set)

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• Update the UI layout link
• warning modal

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