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The HUD buttons section in the Android controls reference showed "→" (right-arrow) for the Hint action, but the actual on-screen button is labelled "!" (ASCII exclamation). Extract ANDROID_HINT_LABEL from hud_plugin so both the spawn path and the help text share a single source of truth. Add a cfg(android) regression test that asserts the hint row's key string matches the const. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>