refactor(app-iced, presenter): M114 rebase 后守 400 行 —— 四处纯搬移（不动语义、不压注释、不挪断言）

主线六条合入后，四个被我碰过的文件越过 400 行；按模块拆开，只搬不改：

- `presenter/host/mod.rs` 421→366：账户刷新/皮肤三段（refresh_accounts / attach_skins /
  request_skins）搬进 `host/accounts/refresh.rs`（`impl CoreHost`，pub(in crate::host)）
- `presenter/state.rs` 410→392：`TileCell` + `grid_positions` 搬进 `state/tiles.rs`，
  `state.rs` 用 `pub use` 再导出，老路径不变
- `app-iced/app/state.rs` 401→394：账户页重建那一段搬进 `app/view/account_page.rs`
  的 `App::rebuild_account_page`
- `app-iced/app/update.rs` 407→388：`ULL_START_ROUTE` 取值表搬进 `app/update/boot_env.rs`
  （纯函数、无状态）

crates/presenter/src/host/job.rs

@@ -8,9 +8,25 @@ use std::sync::mpsc::{Receiver, Sender};
 
 use crate::dto::{
     // 主线（M109 ContentResults / M105 LoaderKind / M113 PackEvent）与 M114 的账户轨并集。
-    AccountView, AuthlibLoginView, ContentResults, DeviceLoginView, DiagnosisReport,
-    InstallProgressView, InstanceId, InstanceRuntime, JavaPageView, LaunchFinished, LiveLogBatch,
-    LoaderKind, LogLine, LogOutcome, LogSession, NoticeView, PackEvent, SessionId, SkinImage,
+    AccountView,
+    AuthlibLoginView,
+    ContentResults,
+    DeviceLoginView,
+    DiagnosisReport,
+    InstallProgressView,
+    InstanceId,
+    InstanceRuntime,
+    JavaPageView,
+    LaunchFinished,
+    LiveLogBatch,
+    LoaderKind,
+    LogLine,
+    LogOutcome,
+    LogSession,
+    NoticeView,
+    PackEvent,
+    SessionId,
+    SkinImage,
     VersionSummary,
 };
 use crate::toast::Toast;