fix: localize basemap place labels by active app language

[koala73]

Summary

• Localizes MapLibre basemap place-name labels to match the app's active i18n language
• Uses coalesce expression to try localized name → generic name → name_en fallback
• Applied on initial map load and after theme switches (style reload)

Changes

• DeckGLMap.ts: new applyBasemapLocalization() method iterates symbol layers on source-layer: 'place' and replaces text-field with a coalesce expression for the current language
• Called after initDeck() and inside style.load callback on theme change

Test plan

• Switch app language to a non-English locale (e.g., French, Arabic, Chinese)
• Verify map place labels display in the selected language
• Switch theme (dark ↔ light) and confirm labels remain localized
• Verify English fallback works for places without translations

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Project	Deployment	Actions	Updated (UTC)
worldmonitor	Ready	Preview, Comment	Mar 5, 2026 2:19am

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