akvo / iwsims / #63

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Pull #22

coveralls-python

[#20] Add derived dashboard computes for Treatment set-up panels

Frontend implementation backing the WTP Treatment set-up config:

- groupedStack.js: collapse per-(group x stack) segment fetches into
  stacked-bar rows. Powers Treatment Chemicals (working/issue per
  chemical) and Back-up Power Supply (well/poorly/no-backup).
- bucketBar.js: single-series bar where each bucket is a direct segment
  count or a subtraction of two (expresses "only" sets the criteria
  grammar's AND-without-NOT cannot). Powers Magnetic Flow Meters.
- ChartRenderer/Dashboard: dispatch + per-segment SegmentFetcher fan-out
  for grouped_stack and bucket_bar (mirrors process_counts).
- dashboardFilterHints: preserve a widget's own criteria string and
  AND-join dashboard custom filters on top instead of overwriting it.
- Tests for both computes and the criteria merge.

Pairs with the config/CSV commit ef26869.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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