akvo / akvo-mis / #590

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[#203] fix excessive re-renders on map view form/question change

- Replace store.useState((s) => s) in DataFilters with individual
  field selectors so it only re-renders when its own fields change
- Wrap all multi-setter groups in ManageDataMap store subscription
  callback, fetchStats (all 3 exit paths), and fetchData with
  unstable_batchedUpdates so React 17 batches them into one render
  instead of firing one render per setState call
- Remove console.log("render!") debug artifact and dead JSX comment
- Reset isNumeric on onMapFormChange to prevent stale GradationLegend

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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