🐛 fix(windows): 修复在线更新挂起与 WebView2 启动闪退

- 隐藏并释放 Windows 更新脚本进程，避免在线更新打开 cmd 并挂起
- 为更新脚本等待宿主进程退出增加超时保护
- 收窄自动 WebView2 zoom reset 触发条件并补充异常兜底
- 补充 Windows 更新启动与窗口缩放回归测试
Refs #468

frontend/src/App.tsx

@@ -72,7 +72,7 @@ import {
   splitConflictsByContext,
   type ConflictInfo,
 } from './utils/shortcuts';
-import { resolveTitleBarToggleIconKey, resolveWindowsScaleCheckDelayMs, shouldApplyWindowsScaleFix, shouldToggleMaximisedWindowForScaleFix, type WindowScaleFixReason, type WindowsScaleCheckTrigger } from './utils/windowStateUi';
+import { resolveTitleBarToggleIconKey, resolveWindowsScaleCheckDelayMs, shouldApplyWindowsScaleFix, shouldResetWebViewZoomForScaleFix, shouldToggleMaximisedWindowForScaleFix, type WindowScaleFixReason, type WindowsScaleCheckTrigger } from './utils/windowStateUi';
 import { resolveVisibleStartupWindowBounds } from './utils/windowRestoreBounds';
 import {
   SIDEBAR_UTILITY_ITEM_KEYS,
@@ -676,7 +676,7 @@ function App() {
                       // 让 WebView2 重算 D2D/DirectWrite 字体度量。完全不动窗口、零动画。
                       // backend 失败（wails 升级破坏反射 / 非 Windows）时回退到 dispatch resize 兜底；
                       // 用户仍可按 Ctrl+Shift+0 手动 toggle 修复。
-                      if (hasViewportScaleDrift) {
+                      if (shouldResetWebViewZoomForScaleFix(reason, hasViewportScaleDrift)) {
                           try {
                               const res = await (window as any).go?.app?.App?.ResetWebViewZoom?.();
                               if (!res?.success) {

frontend/src/utils/windowStateUi.test.ts

@@ -4,6 +4,7 @@ import {
   resolveTitleBarToggleIconKey,
   resolveWindowsScaleCheckDelayMs,
   shouldApplyWindowsScaleFix,
+  shouldResetWebViewZoomForScaleFix,
   shouldToggleMaximisedWindowForScaleFix,
 } from './windowStateUi';
 
@@ -26,6 +27,13 @@ describe('windowStateUi', () => {
     expect(shouldToggleMaximisedWindowForScaleFix('restore', true)).toBe(false);
   });
 
+  it('only calls the backend WebView2 zoom reset after a real restore drift', () => {
+    expect(shouldResetWebViewZoomForScaleFix('restore', true)).toBe(true);
+    expect(shouldResetWebViewZoomForScaleFix('restore', false)).toBe(false);
+    expect(shouldResetWebViewZoomForScaleFix('activation', true)).toBe(false);
+    expect(shouldResetWebViewZoomForScaleFix('ratio-change', true)).toBe(false);
+  });
+
   it('debounces resize-triggered Windows scale checks until window transitions settle', () => {
     expect(resolveWindowsScaleCheckDelayMs('resize')).toBeGreaterThan(0);
     expect(resolveWindowsScaleCheckDelayMs('focus')).toBe(0);

frontend/src/utils/windowStateUi.ts

@@ -20,6 +20,11 @@ export const shouldToggleMaximisedWindowForScaleFix = (
   hasViewportScaleDrift: boolean,
 ): boolean => reason === 'ratio-change' && hasViewportScaleDrift;
 
+export const shouldResetWebViewZoomForScaleFix = (
+  reason: WindowScaleFixReason,
+  hasViewportScaleDrift: boolean,
+): boolean => reason === 'restore' && hasViewportScaleDrift;
+
 export const resolveWindowsScaleCheckDelayMs = (trigger: WindowsScaleCheckTrigger): number =>
   trigger === 'resize' ? 240 : 0;