Add Custom Time Frame Selection for Overview Section

[rickstaa]

Request: Enable users to view the Overview section by a specific time frame (e.g., custom date range).[/+]
Rationale: Allowing flexible date-range selection (beyond existing daily/weekly/monthly options) will help users analyze specific historical periods or events.

[rickstaa]

@ECWireless I think the solution presented in #458 is enough for now. Allowing custom timeframes will make the interface a lot more complex.