fix: read clash mode tolerantly and propagate mode-switch failures

The home mode card read the proxy mode only from mihomo's /configs (strict
BaseConfig); when that response drifted a single field, the whole read
failed and the card showed a bare "communication error". patch_clash_mode
also swallowed backend PATCH failures and always returned Ok, so the UI
could not tell a switch had actually failed.

- add a tolerant get_clash_mode command that reads mode from the saved
  clash config (IClashTemp::get_mode), bypassing strict BaseConfig
  deserialization, and
- make change_clash_mode return Result and have patch_clash_mode propagate
  it; the hotkey/tray callers log-and-ignore as before.

src-tauri/src/core/hotkey.rs

@@ -125,19 +125,22 @@ impl Hotkey {
             }
             HotkeyFunction::ClashModeRule => {
                 AsyncHandler::spawn(async move || {
-                    feat::change_clash_mode("rule".into()).await;
+                    // 错误已在 change_clash_mode 内部记录，此处显式忽略返回值
+                    let _ = feat::change_clash_mode("rule".into()).await;
                     notify_event(NotificationEvent::ClashModeChanged { mode: "Rule" }).await;
                 });
             }
             HotkeyFunction::ClashModeGlobal => {
                 AsyncHandler::spawn(async move || {
-                    feat::change_clash_mode("global".into()).await;
+                    // 错误已在 change_clash_mode 内部记录，此处显式忽略返回值
+                    let _ = feat::change_clash_mode("global".into()).await;
                     notify_event(NotificationEvent::ClashModeChanged { mode: "Global" }).await;
                 });
             }
             HotkeyFunction::ClashModeDirect => {
                 AsyncHandler::spawn(async move || {
-                    feat::change_clash_mode("direct".into()).await;
+                    // 错误已在 change_clash_mode 内部记录，此处显式忽略返回值
+                    let _ = feat::change_clash_mode("direct".into()).await;
                     notify_event(NotificationEvent::ClashModeChanged { mode: "Direct" }).await;
                 });
             }

src-tauri/src/core/tray/mod.rs

@@ -933,7 +933,8 @@ fn on_menu_event(_: &AppHandle, event: MenuEvent) {
                     && let Some(final_mode) = stripped.strip_suffix("_mode")
                 {
                     logging!(info, Type::ProxyMode, "Switch Proxy Mode To: {}", final_mode);
-                    feat::change_clash_mode(final_mode.into()).await;
+                    // 错误已在 change_clash_mode 内部记录，此处显式忽略返回值
+                    let _ = feat::change_clash_mode(final_mode.into()).await;
                 }
             }
             MenuIds::DASHBOARD => {