[FEAT] Display exact meeting date instead of "WEEK OF (MONDAY)" – in both UI and PDFs

[fschein]

Is your feature request related to a problem? Please describe.
Currently, the meeting dates are displayed as "WEEK OF (MONDAY)," which can be confusing when scheduling assignments. It would be much easier to manage assignments if the exact date of each meeting were displayed, instead of just the "week of" label.

Describe the solution you'd like
Allow the option to display the exact date of the meeting instead of the "WEEK OF (MONDAY)" format. This would make it easier to program assignments and view the meetings by their actual dates.

Describe alternatives you've considered
An alternative solution could be to add a system setting where users can choose whether to display the "week of" format or the exact date for each meeting in the assignment list.

Additional context
This change would help improve clarity and streamline scheduling, especially for users who need to assign tasks based on specific dates.

[fschein]

Considering this issue, I suggest that the export feature also respects the 'Use exact meeting date' logic. While the meeting date is displayed correctly as the exact day, the logic of grouping by week causes confusion when meetings span across months.

For example, in our use case, we maintain a Google Drive folder with files organized by month, in addition to the app and printed schedules. If a meeting on January 2 is part of the 'Week of December 30' logic, it should still be grouped under January to avoid misplacement in the December folder.

Adapting the export to group meetings based on their exact dates instead of the weekly logic would better align with real-world organizational needs and improve clarity.