test(statviz): add StockOverview dashboard section tests

[Copilot]

Adds integration tests for the StockOverview section of the analytics Dashboard, covering the full pipeline from mocked GraphQL responses through client-side filtering to rendered chart output.

Approach

Chart mocking — PieChart, BarChart, and CalendarChart (nivo) are replaced with lightweight DOM stubs that render their input data as text nodes and data-testid elements. This lets tests assert on filtered data values without SVG/ResizeObserver complexity in jsdom, while keeping all filter-container logic (the actual business logic under test) fully exercised.

Filter state via URL — Filters are pre-set through the initialUrl parameter (?sp=1, ?sg=Male, ?sc=1, ?sl=2, ?st=1, ?snt=1) rather than driving react-select UIs, matching how the real components work and making tests fast and deterministic.

Mock data

Query	Facts
STOCK_QUERY	3× InStock (Shoes/Male/Cat1/Loc1/Tag1, Shirts/Female/Cat2/Loc2/Tag2, Pants/null/Cat3/Loc3/Tag3) + 1× Donated + 1× Lost
CREATED_BOXES_QUERY	1m ago (product 1), 5m ago (product 2), 10m ago (product 1), 15m ago (product 3 — outside 1-year default window)

Note: productName values in STOCK_QUERY facts are lowercase ("shoes", "shirts", "pants") to match the backend convention; the ring/bar filter logic lowercases p.name from the option list but not the raw productName fact field.

What is tested (14 tests)

• No-filter baseline: ring/bar show only InStock data (Donated+Lost excluded); calendar shows only 3 of 4 facts (15-month fact outside 1-year window)
• Per-filter verification: product, gender, category, location, include-tag, exclude-tag — each narrows ring slices, bar categories, and calendar days to the expected subset; location filter is confirmed to have no effect on the calendar
• Filter chips: label text and chip close-button data-testid asserted for each filter type; excluded-tag chip verified to carry text-decoration: line-through
• Clear filters: via individual chip ×, via "Clear filters (N)" button, and via the filter-panel drawer ("Clear filters" → Apply)
• Boxes/items switch: native <select> (found by getByDisplayValue) switches chart values and headings between boxesCount and itemsCount

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.78%. Comparing base (f2a90ed) to head (3d0cc12).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2872      +/-   ##
==========================================
+ Coverage   73.71%   73.78%   +0.06%     
==========================================
  Files         330      330              
  Lines       25270    25090     -180     
  Branches     2479     2444      -35     
==========================================
- Hits        18628    18512     -116     
+ Misses       6591     6527      -64     
  Partials       51       51              

Flag	Coverage Δ
backend	99.61% <ø> (ø)

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[pylipp]

https://trello.com/c/oZWz7LNi

[Copilot]

Pull request overview

Adds integration-style UI tests for the StockOverview section in the statviz analytics dashboard, validating URL-driven filter behavior and chart output using lightweight nivo chart stubs.

Changes:

• Introduces StockOverview.test.tsx covering baseline rendering, per-filter narrowing, chip clearing flows, and boxes/items switching.
• Mocks nivo chart primitives to assert on filtered data without relying on SVG rendering in jsdom.

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