style: cargo fmt --all（合并期整合修复）

M187/M188 并入后全仓 fmt --check 为红（CI 的 fmt job 会红）。
本次仅 cargo fmt --all 的换行/缩进变化，无语义改动；
cargo fmt --check 与 cargo check 均已复验为绿。

crates/presenter/src/host/logs_tests.rs

@@ -127,7 +127,11 @@ fn legacy_sessions_are_still_listed_and_openable() {
     let env = HostEnv::at_root(&root);
     let legacy_game = env.legacy_sessions_root().join("game");
     std::fs::create_dir_all(&legacy_game).expect("建旧家目录");
-    let entry = sample_entry("old-session", "old-session.jsonl", "2026-11-01T10:00:00.000Z");
+    let entry = sample_entry(
+        "old-session",
+        "old-session.jsonl",
+        "2026-11-01T10:00:00.000Z",
+    );
     session_index::append(
         &session_index::index_path(&env.legacy_sessions_root()),
         &entry,
@@ -144,7 +148,10 @@ fn legacy_sessions_are_still_listed_and_openable() {
         listed.iter().any(|session| session.id == "old-session"),
         "旧家的会话没有出现在列表里：{listed:?}"
     );
-    assert_eq!(event_path(&env, &entry), legacy_game.join("old-session.jsonl"));
+    assert_eq!(
+        event_path(&env, &entry),
+        legacy_game.join("old-session.jsonl")
+    );
     let (lines, _) = open(&env, "old-session");
     assert!(
         lines.iter().any(|line| line.text.contains("旧会话这一行")),
@@ -196,8 +203,11 @@ fn the_new_root_wins_when_both_indexes_know_the_same_id() {
     let legacy_game = env.legacy_sessions_root().join("game");
     std::fs::create_dir_all(&legacy_game).expect("建旧家目录");
     let old = sample_entry("same", "same.jsonl", "2026-10-01T00:00:00.000Z");
-    session_index::append(&session_index::index_path(&env.legacy_sessions_root()), &old)
-        .expect("写旧索引");
+    session_index::append(
+        &session_index::index_path(&env.legacy_sessions_root()),
+        &old,
+    )
+    .expect("写旧索引");
     std::fs::write(
         legacy_game.join("same.jsonl"),
         "{\"kind\":\"stdout\",\"payload\":{\"line\":\"旧\"}}\n",
@@ -235,7 +245,10 @@ fn the_location_receipt_names_both_roots_and_the_policy() {
     std::fs::write(legacy_game.join("a.jsonl"), "{}\n").expect("写旧文件");
 
     let path = note_location(&env).expect("记录应当写得出来");
-    assert_eq!(path, env.logs_dir().join(super::location::SESSION_LOCATION_FILE));
+    assert_eq!(
+        path,
+        env.logs_dir().join(super::location::SESSION_LOCATION_FILE)
+    );
     let value: serde_json::Value =
         serde_json::from_slice(&std::fs::read(&path).expect("读记录")).expect("记录是 JSON");
     assert_eq!(value["policy"], "read-only-compat");