fix(i18n): Contacts panel text and distances in the UI language

The Contacts panel builds its markup in a variable before innerHTML, so
the unmarked-text check missed it: the window caption, "Named areas", the
"at least" count and each cohort's reason stayed English, and distances
read "4.6 km" in every language.

The reason stays English in the cohort summary, which the voice analyst
reads too; it now also carries its template, and the panel shows it in
the UI language. Distances and counts use the locale's number format
and unit.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

scripts/package-boundaries.json

@@ -1176,7 +1176,8 @@
       "src/i18n/index.js",
       "src/i18n/locale.js",
       "src/i18n/locales/es.json",
-      "src/i18n/locales/ru.json"
+      "src/i18n/locales/ru.json",
+      "src/ui/unitLabels.js"
     ],
     "external": ["cesium"]
   },