修复：线程条目投影的上游字符串统一走脱敏与限长

- FunctionCall.name 原来既不脱敏也不截断，改为走 detail_text（脱敏 + THREAD_DETAIL_MAX_CHARS）
- McpToolCall.tool 原来只脱敏不截断，改为 detail_text
- CommandExecution.status、McpToolCall.status、ThreadItem::Other.raw_type、ThreadFileChange.kind 原来原样拷贝，统一按 THREAD_DETAIL_MAX_CHARS 限长，避免单条事件突破声明的事件通道预算

apps/ai-game-creator-shell/src-tauri/src/agent/thread_manager/wire/items.rs

@@ -366,8 +366,8 @@ fn item_changes(root: &Path, item: &Value) -> Vec<ThreadFileChange> {
                         kind: change
                             .get("kind")
                             .and_then(Value::as_str)
-                            .unwrap_or("update")
-                            .to_string(),
+                            .map(|kind| bounded(kind, THREAD_DETAIL_MAX_CHARS))
+                            .unwrap_or_else(|| "update".to_string()),
                     })
                 })
                 .collect::<Vec<_>>()
@@ -430,8 +430,8 @@ pub(crate) fn thread_item_from_value(
             name: item
                 .get("name")
                 .and_then(Value::as_str)
-                .unwrap_or_default()
-                .to_string(),
+                .map(|name| detail_text(root, name))
+                .unwrap_or_default(),
             arguments: field_text(root, item, "arguments").unwrap_or_default(),
             at,
         },
@@ -455,7 +455,7 @@ pub(crate) fn thread_item_from_value(
             status: item
                 .get("status")
                 .and_then(Value::as_str)
-                .map(str::to_string),
+                .map(|status| bounded(status, THREAD_DETAIL_MAX_CHARS)),
             exit_code: item.get("exitCode").and_then(Value::as_i64),
             at,
         },
@@ -471,7 +471,7 @@ pub(crate) fn thread_item_from_value(
                 .and_then(Value::as_str)
                 .map(str::trim)
                 .filter(|tool| !tool.is_empty())
-                .map(|tool| sanitize_detail_text(root, tool))
+                .map(|tool| detail_text(root, tool))
                 .unwrap_or_default(),
             arguments: field_text(root, item, "arguments").unwrap_or_default(),
             output: ["result", "error"]
@@ -480,7 +480,7 @@ pub(crate) fn thread_item_from_value(
             status: item
                 .get("status")
                 .and_then(Value::as_str)
-                .map(str::to_string),
+                .map(|status| bounded(status, THREAD_DETAIL_MAX_CHARS)),
             at,
         },
         "webSearch" => ThreadItem::WebSearch {
@@ -497,7 +497,7 @@ pub(crate) fn thread_item_from_value(
         "contextCompaction" => ThreadItem::ContextCompaction { item_id, at },
         other => ThreadItem::Other {
             item_id,
-            raw_type: other.to_string(),
+            raw_type: bounded(other, THREAD_DETAIL_MAX_CHARS),
             at,
         },
     })