Merge main and preserve voice panel and GhostMaps schema coverage

changelog.d/1297-s2-ghostmaps-layer.md

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+- Add the S2 GhostMaps layer: S2 Underground's public KMZ intel products
+  (Common Intelligence Picture, 30-day kinetic pull, Border Crisis Map, Iran
+  and Yemen products and the newest incident drop) from
+  github.com/s2underground/GhostMaps, with one chip per product and report
+  cards on click. `/api/ghostmaps` watches the repository's branch head every
+  15 s and pushes each new commit to open pages, which reload only the
+  products that changed (Black Pine Defense).
+- Clear a temporary GhostMaps upstream error and notify open pages when the
+  repository becomes reachable again, including when no new edition was published.
+- Release packed-image resources when a load is cancelled or fails, respect
+  injected or omitted GhostMaps sources, and wait for background cache warm-up
+  before removing provider test fixtures.
+- Include Simplified Chinese translations and keep the combined voice prompt
+  within its existing size limit while retaining all spoken aliases.