feat: add 'pop out tab as new window' functionality

- Add createWindow IPC for creating secondary windows
- Add PopoutPage for content-only rendering in new windows
- Add multi-window management to electron state
- Add '在新窗口中打开' context menu to tabs
- Fix: Use standard URL path instead of hash for React Router routing

electron/state.ts

@@ -13,6 +13,8 @@ class ElectronState {
     isDev: false,
   }
 
+  private windows = new Map<number, BrowserWindow>()
+
   getMainWindow(): BrowserWindow | null {
     return this.state.mainWindow
   }
@@ -37,7 +39,24 @@ class ElectronState {
     this.state.isDev = isDev
   }
 
+  addWindow(window: BrowserWindow): void {
+    this.windows.set(window.id, window)
+  }
+
+  removeWindow(id: number): void {
+    this.windows.delete(id)
+  }
+
+  getWindow(id: number): BrowserWindow | undefined {
+    return this.windows.get(id)
+  }
+
+  getAllWindows(): BrowserWindow[] {
+    return Array.from(this.windows.values())
+  }
+
   reset(): void {
+    this.windows.clear()
     this.state = {
       mainWindow: null,
       serverPort: 3001,