refactor(profiles): drop manual snapshot update now that switching autosaves

Since switching projects automatically saves the current configuration
back to the project being left, the per-project "update from current"
button is redundant and even harmful: it allowed overwriting another
project's snapshot with the current state, breaking the invariant that
a project holds the state you last left it in.

- Remove the resnapshot button and confirm dialog from the manage
  dialog; drop the now-unused scope prop and PROFILE_SCOPE_LABELS
- Add a footer Close button to the manage dialog (overlay click is
  disabled app-wide, so it previously could only be closed via Esc)
- Update manageDescription in all four locales to describe the
  autosave behavior; remove the two dead i18n keys
- Fix a shadowed `warnings` vec in ProfileService::apply that silently
  dropped autosave-failure warnings before they reached the frontend
- Mention auto-capture on next switch in the "no snapshot for this
  scope yet" warning and doc comments

The backend update command keeps its resnapshot parameter; it is now
only exercised by the pre-switch autosave path.

src-tauri/src/commands/profile.rs

@@ -184,12 +184,7 @@ pub fn apply_profile(
                 log::warn!("切换项目后停止代理服务失败: {e}");
             }
             if let Some(app_state) = app_handle.try_state::<AppState>() {
-                emit_profile_apply_events(
-                    &app_handle,
-                    app_state.inner(),
-                    &profile_id,
-                    scope,
-                );
+                emit_profile_apply_events(&app_handle, app_state.inner(), &profile_id, scope);
             }
         });
     } else {

src-tauri/src/services/profile.rs

@@ -264,7 +264,8 @@ impl ProfileService {
     }
 
     /// 更新项目：重命名（作用于共享实体）和/或以当前状态重拍快照
-    /// （resnapshot 只覆盖 scope 分组的槽位，其余分组原样保留）
+    /// （resnapshot 只覆盖 scope 分组的槽位，其余分组原样保留；
+    /// 快照重拍仅由 [`Self::apply`] 切换前的自动保存触发，UI 不再暴露手动入口）
     pub fn update(
         state: &AppState,
         id: &str,
@@ -314,7 +315,7 @@ impl ProfileService {
     ///
     /// 只作用于发起页所属分组内的应用，不碰其他分组的配置与 current 标记。
     /// 该分组从未拍过快照时不改动任何配置，仅标记 current 并返回提示
-    /// （用户可先绑定项目、再"以当前状态更新"补拍该侧快照）。
+    /// （下次从该项目切走时，自动保存会补拍该侧快照）。
     ///
     /// **切换前会自动保存旧项目**：若当前分组已绑定到另一个项目，先把当前
     /// 状态写入那个旧项目（仅当前分组槽位），再加载目标项目。这样切走后
@@ -351,10 +352,9 @@ impl ProfileService {
         let payload: ProfilePayload = serde_json::from_str(&profile.payload)
             .map_err(|e| AppError::Config(format!("解析 profile payload 失败: {e}")))?;
 
-        let mut warnings = Vec::new();
         if !payload.scope_captured(scope) {
             warnings.push(format!(
-                "no {} configuration captured in this project yet; marked as current without changes",
+                "no {} configuration captured in this project yet; marked as current without changes (it will be saved automatically when you switch away)",
                 scope.as_str()
             ));
         }