[A-EDev]

Summary

spec/store.md limits a live message to 64 KiB. The server's socket enforced that, but LAN frames allow far more, so a larger one could still be opened. Opening a live message now checks the limit, whichever transport it came through. The limit lives in one constant.

Related issue

None.

Change type

• Bug fix

Validation

• cargo fmt --all: run before committing.
• cargo test --lib live_seal in src-tauri: passed. With the check taken out, the new test fails.
• cargo test --test sync2_live --test sync2_server_live: 2 passed; the 2 tests in sync2_server_live are ignored by default and were not run.
• CI runs the full suite on this PR.
• Not smoke-tested in a window or on a device.

Risk and compatibility

No format change. Honest messages stay well under the limit: a queue holds at most 50 items.

• No new secrets, private data, telemetry, or broad Tauri permissions were introduced.

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