[frontend] PayrollAnalytics date range picker allows start-after-end selections

[Wilfred007]

Description

The date range picker on PayrollAnalytics.tsx doesn't validate that the selected start date precedes the end date, allowing an inverted range to be submitted and produce an empty or nonsensical chart with no explanatory error.

Where

frontend/src/pages — PayrollAnalytics.tsx

Acceptance Criteria

• Validate start < end before applying the filter, with a clear inline error otherwise
• Add a test for the inverted-range rejection

[leocagli]

Hi! I'd like to work on this. The fix is to disable or visually flag the end-date picker when end < start, and swap/clamp the values with a brief warning. Pure frontend. Could I be assigned?

[Waffiyyi]

@Waffiyyi has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would love to work on this issue. Please assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Waffiyyi to this issue.