refactor: eliminate startup flicker — defer window show until overlay renders

- Remove Rust-side `eval(INITIAL_LOADING_OVERLAY)` that prematurely
  dismissed the overlay before React/MUI theme was ready
- Defer `window.show()` from Rust `activate_window` to an inline
  `<script>` in index.html, executed after the themed overlay is in DOM
- Remove `useAppInitialization` hook (duplicate of `useLoadingOverlay`
  with no themeReady gate)
- Simplify overlay to pure theme-colored background — no spinner or
  loading text — so fast startup feels instant
- Simplify `hideInitialOverlay` API and reduce overlay fade to 0.2s
- Clean up unused CSS variables (spinner-track, spinner-top, etc.)

src-tauri/src/utils/resolve/window.rs

@@ -2,11 +2,7 @@ use dark_light::{Mode as SystemTheme, detect as detect_system_theme};
 use tauri::utils::config::Color;
 use tauri::{Theme, WebviewWindow};
 
-use crate::{
-    config::Config,
-    core::handle,
-    utils::resolve::window_script::{INITIAL_LOADING_OVERLAY, build_window_initial_script},
-};
+use crate::{config::Config, core::handle, utils::resolve::window_script::build_window_initial_script};
 use clash_verge_logging::{Type, logging_error};
 
 const DARK_BACKGROUND_COLOR: Color = Color(46, 48, 61, 255); // #2E303D
@@ -82,7 +78,6 @@ pub async fn build_new_window() -> Result<WebviewWindow, String> {
     match builder.build() {
         Ok(window) => {
             logging_error!(Type::Window, window.set_background_color(Some(background_color)));
-            logging_error!(Type::Window, window.eval(INITIAL_LOADING_OVERLAY));
             Ok(window)
         }
         Err(e) => Err(e.to_string()),

src-tauri/src/utils/resolve/window_script.rs

@@ -91,11 +91,3 @@ pub const WINDOW_INITIAL_SCRIPT: &str = r##"
 
     console.log('[Tauri] 窗口初始化脚本执行完成');
 "##;
-
-pub const INITIAL_LOADING_OVERLAY: &str = r"
-    const overlay = document.getElementById('initial-loading-overlay');
-    if (overlay) {
-        overlay.style.opacity = '0';
-        setTimeout(() => overlay.remove(), 300);
-    }
-";

src-tauri/src/utils/window_manager.rs

@@ -285,6 +285,7 @@ impl WindowManager {
     }
 
     /// 创建新窗口,防抖避免重复调用
+    /// 窗口创建后保持隐藏，由前端 index.html 在 overlay 渲染后调用 show，避免主题闪烁
     pub fn create_window(is_show: bool) -> Pin<Box<dyn Future<Output = bool> + Send>> {
         Box::pin(async move {
             logging!(info, Type::Window, "开始创建/显示主窗口, is_show={}", is_show);
@@ -293,23 +294,22 @@ impl WindowManager {
                 return false;
             }
 
-            let window = match build_new_window().await {
-                Ok(window) => {
-                    logging!(info, Type::Window, "新窗口创建成功");
-                    window
+            match build_new_window().await {
+                Ok(_) => {
+                    logging!(info, Type::Window, "新窗口创建成功，等待前端渲染后显示");
+
+                    #[cfg(target_os = "macos")]
+                    {
+                        handle::Handle::global().set_activation_policy_regular();
+                    }
+
+                    true
                 }
                 Err(e) => {
                     logging!(error, Type::Window, "新窗口创建失败: {}", e);
-                    return false;
+                    false
                 }
-            };
-
-            // 直接激活刚创建的窗口，避免因防抖导致首次显示被跳过
-            if WindowOperationResult::Failed == Self::activate_window(&window) {
-                return false;
             }
-
-            true
         })
     }
 

src/index.html

@@ -11,27 +11,15 @@
     <title>Clash Verge</title>
     <style>
       :root {
-        --initial-bg: #f5f5f5;
-        --initial-text: #333;
-        --initial-spinner-track: #e3e3e3;
-        --initial-spinner-top: #3498db;
-        --bg-color: var(--initial-bg);
-        --text-color: var(--initial-text);
-        --spinner-track: var(--initial-spinner-track);
-        --spinner-top: var(--initial-spinner-top);
+        --bg-color: #f5f5f5;
+        --text-color: #333;
         color-scheme: light;
       }
 
       @media (prefers-color-scheme: dark) {
         :root {
-          --initial-bg: #2e303d;
-          --initial-text: #ffffff;
-          --initial-spinner-track: #3a3a3a;
-          --initial-spinner-top: #0a84ff;
-          --bg-color: var(--initial-bg);
-          --text-color: var(--initial-text);
-          --spinner-track: var(--initial-spinner-track);
-          --spinner-top: var(--initial-spinner-top);
+          --bg-color: #2e303d;
+          --text-color: #ffffff;
           color-scheme: dark;
         }
       }
@@ -53,48 +41,28 @@
         position: fixed;
         inset: 0;
         background: var(--bg-color);
-        color: var(--text-color);
-        display: flex;
-        flex-direction: column;
-        align-items: center;
-        justify-content: center;
         z-index: 9999;
-        font-family:
-          -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-        transition: opacity 0.3s ease;
+        transition: opacity 0.2s ease-out;
       }
 
       #initial-loading-overlay[data-hidden='true'] {
         opacity: 0;
         pointer-events: none;
       }
-
-      .initial-spinner {
-        width: 40px;
-        height: 40px;
-        border: 3px solid var(--spinner-track);
-        border-top: 3px solid var(--spinner-top);
-        border-radius: 50%;
-        animation: initial-spin 1s linear infinite;
-      }
-
-      @keyframes initial-spin {
-        0% {
-          transform: rotate(0deg);
-        }
-        100% {
-          transform: rotate(360deg);
-        }
-      }
     </style>
   </head>
   <body>
-    <div id="initial-loading-overlay">
-      <div class="initial-spinner"></div>
-      <div style="font-size: 14px; opacity: 0.7; margin-top: 20px">
-        Loading Clash Verge...
-      </div>
-    </div>
+    <div id="initial-loading-overlay"></div>
+    <script>
+      if (window.__TAURI_INTERNALS__) {
+        window.__TAURI_INTERNALS__
+          .invoke('plugin:window|show', { label: 'main' })
+          .catch(function () {});
+        window.__TAURI_INTERNALS__
+          .invoke('plugin:window|set_focus', { label: 'main' })
+          .catch(function () {});
+      }
+    </script>
     <div id="root"></div>
     <script type="module" src="./main.tsx"></script>
   </body>

src/pages/_layout.tsx

@@ -44,7 +44,6 @@ import { useThemeMode } from '@/services/states'
 import getSystem from '@/utils/get-system'
 
 import {
-  useAppInitialization,
   useCustomTheme,
   useLayoutEvents,
   useLoadingOverlay,
@@ -217,7 +216,6 @@ const Layout = () => {
   )
 
   useLoadingOverlay(themeReady)
-  useAppInitialization()
 
   const handleNotice = useCallback(
     (payload: [string, string]) => {

src/pages/_layout/hooks/index.ts

@@ -1,4 +1,3 @@
-export { useAppInitialization } from './use-app-initialization'
 export { useLayoutEvents } from './use-layout-events'
 export { useLoadingOverlay } from './use-loading-overlay'
 export { useNavMenuOrder } from './use-nav-menu-order'

src/pages/_layout/hooks/use-app-initialization.ts

@@ -1,51 +0,0 @@
-import { useEffect, useRef } from 'react'
-
-import { hideInitialOverlay } from '../utils'
-
-export const useAppInitialization = () => {
-  const initRef = useRef(false)
-
-  useEffect(() => {
-    if (initRef.current) return
-    initRef.current = true
-
-    let isCancelled = false
-    const timers = new Set<number>()
-
-    const scheduleTimeout = (handler: () => void, delay: number) => {
-      if (isCancelled) return -1
-      const id = window.setTimeout(() => {
-        if (!isCancelled) {
-          handler()
-        }
-        timers.delete(id)
-      }, delay)
-      timers.add(id)
-      return id
-    }
-
-    const removeLoadingOverlay = () => {
-      hideInitialOverlay({ schedule: scheduleTimeout })
-    }
-
-    const performInitialization = () => {
-      if (isCancelled) return
-      removeLoadingOverlay()
-    }
-
-    scheduleTimeout(performInitialization, 100)
-    scheduleTimeout(performInitialization, 5000)
-
-    return () => {
-      isCancelled = true
-      timers.forEach((id) => {
-        try {
-          window.clearTimeout(id)
-        } catch (error) {
-          console.warn('[Initialization] Failed to clear timer:', error)
-        }
-      })
-      timers.clear()
-    }
-  }, [])
-}

src/pages/_layout/hooks/use-loading-overlay.ts

@@ -3,46 +3,15 @@ import { useEffect, useRef } from 'react'
 import { hideInitialOverlay } from '../utils'
 
 export const useLoadingOverlay = (themeReady: boolean) => {
-  const overlayRemovedRef = useRef(false)
+  const doneRef = useRef(false)
 
   useEffect(() => {
-    if (!themeReady || overlayRemovedRef.current) return
-
-    let removalTimer: number | undefined
-    let retryTimer: number | undefined
-    let attempts = 0
-    const maxAttempts = 50
-    let stopped = false
-
-    const tryRemoveOverlay = () => {
-      if (stopped || overlayRemovedRef.current) return
-
-      const { removed, removalTimer: timerId } = hideInitialOverlay({
-        assumeMissingAsRemoved: true,
-      })
-      if (typeof timerId === 'number') {
-        removalTimer = timerId
-      }
-
-      if (removed) {
-        overlayRemovedRef.current = true
-        return
-      }
-
-      if (attempts < maxAttempts) {
-        attempts += 1
-        retryTimer = window.setTimeout(tryRemoveOverlay, 100)
-      } else {
-        console.warn('[Loading Overlay] Element not found')
-      }
-    }
-
-    tryRemoveOverlay()
+    if (!themeReady || doneRef.current) return
+    doneRef.current = true
 
+    const timer = hideInitialOverlay()
     return () => {
-      stopped = true
-      if (typeof removalTimer === 'number') window.clearTimeout(removalTimer)
-      if (typeof retryTimer === 'number') window.clearTimeout(retryTimer)
+      if (timer !== undefined) window.clearTimeout(timer)
     }
   }, [themeReady])
 }

src/pages/_layout/utils/initial-loading-overlay.ts

@@ -1,45 +1,17 @@
-const OVERLAY_ID = 'initial-loading-overlay'
-const REMOVE_DELAY = 300
+let removed = false
 
-let overlayRemoved = false
+export const hideInitialOverlay = (): number | undefined => {
+  if (removed) return undefined
 
-type HideOverlayOptions = {
-  schedule?: (handler: () => void, delay: number) => number
-  assumeMissingAsRemoved?: boolean
-}
-
-type HideOverlayResult = {
-  removed: boolean
-  removalTimer?: number
-}
-
-export const hideInitialOverlay = (
-  options: HideOverlayOptions = {},
-): HideOverlayResult => {
-  if (overlayRemoved) {
-    return { removed: true }
-  }
-
-  const overlay = document.getElementById(OVERLAY_ID)
+  const overlay = document.getElementById('initial-loading-overlay')
   if (!overlay) {
-    if (options.assumeMissingAsRemoved) {
-      overlayRemoved = true
-      return { removed: true }
-    }
-    return { removed: false }
+    removed = true
+    return undefined
   }
 
-  overlayRemoved = true
+  removed = true
   overlay.dataset.hidden = 'true'
 
-  const schedule = options.schedule ?? window.setTimeout
-  const removalTimer = schedule(() => {
-    try {
-      overlay.remove()
-    } catch (error) {
-      console.warn('[Loading Overlay] Removal failed:', error)
-    }
-  }, REMOVE_DELAY)
-
-  return { removed: true, removalTimer }
+  const timer = window.setTimeout(() => overlay.remove(), 200)
+  return timer
 }