Alert browser: improve area/region labeling for non-US sources (Canada, MeteoAlarm)

[kellylford]

Background

For U.S. NWS alerts we now append the state abbreviation to each affected area (e.g. "Limestone, AL; Moore, TN"), derived by zipping areaDesc with the parallel geocode.UGC codes (each code's first two letters are the state). See the alert browser digest → group detail.

The non-US providers don't yet get equivalent treatment, so their affected-area labels can be terse, bare, or inconsistent.

What to improve

• Canada (ECCC). Area is currently built from feature_name_en + province joined by ", ". Verify this reads well for every alert type, and that the province is present/abbreviated consistently (some feeds may omit it or spell it out).
• Europe (MeteoAlarm). Area comes from the CAP <area><areaDesc> values joined by ", ". These are region/zone names with no country context — when browsing a single country that's implicit, but the label granularity and readability vary a lot country to country (some give named regions, some codes). Consider whether a country prefix/suffix or cleanup is warranted.

Notes

• The US mechanism (UGC state prefix) is US-specific and does not generalize — each provider needs its own approach based on the fields its feed actually carries.
• Accessibility: whatever labeling we land on must read cleanly as a single VoiceOver element per area row, consistent with the US rows.
• Not urgent; filed to track the non-US half after the US state-suffix change.

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