[jm-rivera]

Get Data's unit picker, About this answer panel and download dialog now show each fact once, in words a reader can use, and keep the actions that change the answer next to the facts they change.

Changes

• Unit picker: no standing euro preset, the currency of a country the question names stays, and a "Search N currencies by name or code" field comes first (unitPresets, currencySearchLabel in src/lib/search/unitPicker.ts; UnitPicker.tsx).
• About this answer: each fact appears once, and a fact the search filled in carries its reason and a Change control (buildWhySummary in src/lib/search/view.ts; WhyPanel.tsx).
• Change controls open the sentence word's menu or Refine through one resolver shared with departures (changeTarget in src/lib/search/refineMenu.ts; openMenu lifted into DataSearch.tsx).
• Breakdowns list their categories with no variable count, and the variable list and family note are gone.
• The Measure row shows the publisher's indicator code from stat_vars.source_codes, and the DFO variable id sits behind a copy control.
• The source appears once with publisher and licence, and the citation says "processed by" only when a unit conversion was applied (citation in view.ts).
• Download dialog: one switch for README, SOURCES.md, CITATION.cff and datapackage.json, extra columns folded under plain names with examples taken from the answer, and blank counts in words (DownloadOptions.tsx, src/lib/search/downloadOptions.ts).
• Extra columns the long file already writes are hidden by the options document's in_long_layout flag (enrichmentAlreadyInFile), with the long_layout_defaults comparison as the fallback while the API does not serve it.

Notes for reviewers

• The Party kind, class and whole rows stay visible until dfo-apis serves in_long_layout. The vendored client does not type the field yet, so DatasetEnrichment widens it locally in searchClient.ts.
• The ISO 2-letter row shows no example: the spec carries only the Data Commons ref, which holds the 3-letter code.
• A Change for a word-menu row appears one render after the answer lands, because the heading reports its drawn menus through an effect (onMenuChanges).
• A summed family of variables still cites "via": the website sees unit requests only.

Testing: pnpm lint, pnpm lint:css, pnpm typecheck, pnpm test (2,190 pass) and pnpm build pass. Before and after screenshots against the dev API are below.

Screenshots

Before is origin/dev (b91925c) and after is this branch, both against the dev API through a local proxy, at 1440 by 900.

Change	Before	After
Unit picker for a Mozambique answer: a currency search field comes first and the list shows only the current unit and the Mozambican metical
Kenyan shilling preset on a Mozambique question: the typed filter "kes" leaves one row, Kenyan shillings, with Prices below it and no clipped heading
About this answer for Mozambique: the column token goes, and Change links, a licence line and a Cite as row arrive
About this answer for Somalia: the column token and the "1 value" line go, and Change links and a Cite as row arrive
Download dialog: one README, sources and citation tick with file names, and a closed Extra columns fold
Download dialog with Extra columns open	Not present