Revert "cmux NEXT Home: plural step counts in every locale; the store keeps the thought's headline, not its text"
Summary
Takes back #22707: it merged at 75a8be4c77d6 without no SHIP review receipt on the head; no risk tier label.
Opened by merge-audit (leo-workspace tools/merge_audit.py), which never merges it, and next-autoland never lands it: a person does. To keep #22707 instead, add the missing evidence for 75a8be4c77d6 on #22707 (an independent review's Review (subagent, correctness first): SHIP at <head> comment, a green compile, a risk tier; for a compile the router skipped, land-now from a maintainer); the next audit pass then closes this PR. Otherwise review and land it.
Changelog
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Summary by cubic
Reverts #22707, which changed the Home store to publish only a thought's headline for the running indicator and added plural step-count strings for every locale. This restores the prior behavior: the store keeps the full thought text, headline extraction happens in the UI layer, and the new plural translations are removed.