fix(hud): lead with the state tag, keep feedState in get_hud_caption

Review fixes for the HUD summary language change:

- The translated feed-state tag now leads the one-line summary and the
  fallback line, so the readout's ellipsis cannot hide it.
- get_hud_caption checks the reply's feedState, returns it and appends the
  state tag; a reply naming another state keeps only the place.
- The model gets the layer names the user sees (localizeLayerName).
- Japanese and Chinese summaries are capped at 20 characters; pt, zh-CN and
  zh-Hant get explicit language names.
- A partial view is narrated as incomplete coverage, not as not live.
- provenanceTag and hudSummaryMatchesProvenance move to layerSnapshot.js so
  the tools package can use them without browser globals.
- docs/CURRENT-STATE.md, changelog and comments updated; redundant tests
  trimmed.

changelog.d/1488-hud-summary-language.md

@@ -1,5 +1,3 @@
-- Write the AI HUD summary in the interface language. The model now returns
-  the feed state as its own field, and the HUD checks it against its own and
-  adds its translated state tag, so a stale or partial view is never shown as
-  live. A partial layer no longer reads as off or nominal in the HUD, voice
-  and analyst provenance (German, @gekh, #1488).
+- Write the AI HUD summary in the interface language, led by the HUD's own
+  translated feed-state warning. A partial layer no longer reads as off or
+  nominal in the HUD, voice and analyst answers (German, @gekh, #1488).