fix: Insights report can make an invalid API request

[Zlendy]

Details

Error returned: fields: Array must contain at least 1 element(s)

This error is caused because the following zod validation is performed on the server but the client just checks if either fields or filters is defined.

umami/src/app/api/reports/insights/route.ts

Line 27 in 8525188

.min(1),

How to reproduce

1. Create a new Insights report
2. Define one or more filters but NOT any fields.
3. Run query
4. Observe how the button shows an infinite loading spinner and an error is thrown in console

Screenshots

Before	After

[vercel]

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[greptile-apps]

PR Summary

This PR fixes a validation mismatch in the Insights report where the client allowed reports with only filters while the server required at least one field, causing an infinite loading state.

• Modified /src/app/(main)/reports/insights/InsightsParameters.tsx to remove filters check from queryEnabled condition, now only requiring websiteId, dateRange, and fields.length
• Server validation in /src/app/api/reports/insights/route.ts enforces minimum 1 field requirement through zod schema
• Added clear error handling to prevent infinite loading spinner when validation fails

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