A Modern Warfare 4 beta update nerfs footsteps, and adds a new map and mode

[zh] Coverage of "A Modern Warfare 4 beta update nerfs footsteps, and adds a new map and mode" is circulating publicly. This independent recap highlights what was officially said and why it matters, with full credit and a link to the original source.

• [zh] Official information only
• [zh] Original source linked
• [zh] Independently summarized

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