Date-range analytics with comparison

[therealjhay]

ProblemDashboard stat cards show fixed 30d numbers; there is no date-range selection or period comparison.

Solution

• Add a date-range picker (7/30/90d, custom) to the dashboard and admin overview, persisted in the URL.
• Back the stats hooks with from/to params and render compare-period deltas (current vs previous).
• Derive the header total and chart series from the same dataset (guaranteeing sum equality).
• Show a "data window" label so users know what range they see.

Acceptance Criteria

• Switching range refetches stats and charts with the same source.
• Compare deltas are computed against the immediately preceding window.
• Range persists across navigation via URL.
• npm run build passes.

Note for Contributors: Write a clear PR description. Show 7d vs 30d with correct deltas.

[Peculiarr7]

Hi! I came across this issue and would love to work on it. I have experience with similar tasks and I'm confident I can investigate, implement a clean solution, and thoroughly test it before submitting a PR. If the issue is still open, I would appreciate it if you could assign it to me. I’ll prioritize this immediately and ensure a reliable solution is delivered as soon as possible. Thank you!

[Eyanus]

Hello Maintainer,

I’d like to work on this issue. I understand the requirements and I’m confident I can implement a clean and reliable solution following the project’s standards, including proper testing.

I would appreciate the opportunity to contribute.

Thank you.

[grantfox-oss]

🦊 GrantFox — @Eyanus has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #471)
2. Your PR will be reviewed by the Betta-Pay maintainers

Good luck! Track your progress on GrantFox.