useDashboardData read `lang` straight out of sources.json, where it is frozen at
"en", and nothing ever overrode it. So every row the dashboard fetched came back
English regardless of the reader's locale.
The result was not a uniformly English page, which would at least be honest. It
was worse. DashboardChartsRail localizes its country labels through
countryName(), so at ?lang=ar the top-countries chart read الصين while the table
row directly beneath it read "People's Republic of China" — and a page that is
half translated looks like a bug in the half that works. Three surfaces rendered
the raw English label: the data table's country column
(dashboard.config.js:299), the detail drawer (DashboardDetailDrawer.vue:171) and
the search-result subtitle (DashboardTopBar.vue:327).
Fixing it at the SOURCE rather than at the three render sites is what makes them
agree: ask the API in the reader's language and the labels arrive correct, with
no countryName() call and no third spelling of a country's name to reconcile.
DataSourceManager.js:261 has done exactly this for its own callers all along —
`if (this.locale) extraParams.lang = this.locale` — and doxa-research-map,
doxa-simple-map and country-posters all pass a locale in. This composable simply
never got the same treatment.
BOTH LOCALE CHANNELS, because it genuinely arrives by either: `lang` is provided
by ProfileLoader for an element configured through profile-config, and
window[PAGE_LOCALE_KEY] is what a generated leaf sets from ?lang= — the URL a
person actually shares. Reading only one left the regions dashboard's data
labels English on the shared-link path while its chrome translated, which is the
measurement this copies rather than rediscovers.
Resolved at REQUEST time, not captured at setup, so a locale switch cannot pin
the dashboard to whichever language happened to load first.
AND A LOCALE CHANGE NOW REFETCHES. load() ran only onMounted, so switching
language mid-session would have re-rendered chrome over data still in the old
language — the same defect one layer up. Same shape as region-dashboards.vue:680,
guarded on a real change so the mount fetch is not doubled.
Caught while writing it: my first version of that watch called inject() inside
the callback, where it does not work — it warns on every tick and returns null.
The ref is captured in setup and only read later, which is what this file already
does for profileConfig, for the same reason.
Proved headless: locale resolution across all four channels (leaf ?lang=,
injected profile-config, neither, and injected-beats-runtime), then that the
chart, the table column, the drawer and the search subtitle produce the SAME
string for CHN, LAO and COD at ar — the disagreement that started this. The
API's ?lang= behaviour itself is not my assumption: it was measured live at ar
and zh on region-dashboards (its comment at :366).
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