refactor: enrich agents overview page with useful information #1492

[beesaferoot]

Closes #1492

Brief summary of the change made

Are there any other side effects of this change that we should be aware of?

Describe how you tested your changes?

Pull Request checklist

Please confirm you have completed any of the necessary steps below.

• Meaningful Pull Request title and description
• Changes tested as described above
• Added appropriate documentation for the change.
• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[dmohns]

LGTM

[dmohns]

Suggested change

	->withCount(['soldAppliances as sales_count'])
	->withExists(['balanceHistory as is_active' => fn (Builder $query) => $query->where('created_at', '>=', now()->subDays(self::ACTIVE_WINDOW_DAYS))]);
	->withCount(['soldAppliances AS sales_count'])
	->withExists(['balanceHistory AS is_active' => fn (Builder $query) => $query->where('created_at', '>=', now()->subDays(self::ACTIVE_WINDOW_DAYS))]);

Tiny nit: Let's use capitalised SQL keywords (like you are already doing above for COUNT and DISTINCT.

[beesaferoot]

Done and ready for review.