## PURPOSE

Generic UX improvements to ease the use of Planning and the onboarding.

### Details

- When selecting a task on a shift, set automatically the user assigned to the task to the shift (only applicable if the employee_id field is false)
- An internal user without any access to the Planning app should see all published open shifts if both the default_planning_role_id and planning_role_ids fields on his hr.employee are false
    - if one of these fields are set, he should only see the published open shifts for his roles
- Remove the 'allocated time percentage' feature
- In "Timesheet and planning analysis" report: 
    - Add 'time off' measure that represents the number of working hours during which the employee was on time off.
    - Update the 'Difference' to represent the difference between the sum of planning hours and the time off and the effective hours. Calculation: `planned_hours + time off measure - effective_hours`.
    - Remove the 'number of working hours' measure.
- In "Planning Analysis" report: 
    - Add 'time off' measure that represents the number of working hours during which the employee was on time off.
    - Add the 'number of working hours' measure.
    - Add an 'allocated working hours (%)' measure which should represent the % of (allocated hours + time off) based on the working hours for the selected period.
- Add kanban view to the following menus: 
    - reporting > planning analysis
    - configuration > roles
    - configuration > shift templates
- Add an 'active' filter and a corresponding 'archived' filter to the following models: planning.role, planning.slot.template.
- For `planning.slot.template` model: 
     - Add a *sequence* field, the templates will be ordered on the shift form view accordingly.
     - Add a *name* field that represent the "start hour - end hour (x days span)".
     - remove the start hour and duration fields in the list view.
- In calendar view of planning.slot model, when the shift is a single day and not an entire day then display the end hour of this shift.
- When the user wants to send the schedule and there are no shifts to send, we replace the blocking error by a red toast notification that states: "There are no shifts to send or publish.".
- In gantt view of `planning.slot` model:
    - When the user creates a shift via the form view available in the gantt and want to save it as template, we display the following toast notification when a template is created: "fa-check This shift was successfully saved as a template.".
    - the default start/end dates of newly created shifts should be today's date if the period of the gantt view contain the today date otherwise the default start/end dates are the first working day of the company in the period.
    - when the user clicks on the "Send schedule" button: display a green toast notification that states 'fa-check The schedule was successfully sent to your employees.'
- In form view of `planning.slot` model: 
    - the space between the 'repeat' and 'save as template' fields has been removed.
    - when setting repeat to true on an existing shift, the default values should be '1 week' and 'forever'.
- Change the helper to 'No shifts found. Let's create one!...' when there are no shifts in the schedule menus.
- Change the helper to: 'No shift templates found. Let's create one!...' when there are no shift templates.

task-2463722