fix: Simplify URL handling and service initialization

- Replace BrowserUtil.browse(URL(url)) with BrowserUtil.browse(url)
- Use getService(Class) instead of service<T>() extension function
- Refactor ToolWindowStateListener to use standard conditional logic

Author: yangbobo2021

src/main/kotlin/ai/devchat/core/handlers/OpenLinkRequestHandler.kt

@@ -17,7 +17,7 @@ class OpenLinkRequestHandler(project: Project, requestAction: String, metadata:
 
     override fun action() {
         val url = payload!!.getString("url")
-        BrowserUtil.browse(URL(url))
+        BrowserUtil.browse(url)
         send()
     }
 }

src/main/kotlin/ai/devchat/plugin/DevChatToolWindowFactory.kt

@@ -59,7 +59,7 @@ class DevChatToolWindowFactory : ToolWindowFactory, DumbAware, Disposable {
         Log.info("-----------> DevChatToolWindowFactory.createToolWindowContent started")
 
         try {
-            project.service<RecentFilesTracker>()
+            project.getService(RecentFilesTracker::class.java)
             Log.info("-----------> RecentFilesTracker service initialized")
 
             val devChatService = project.getService(DevChatService::class.java)

src/main/kotlin/ai/devchat/plugin/ToolWindowStateListener.kt

@@ -4,7 +4,6 @@ import ai.devchat.common.Constants.ASSISTANT_NAME_ZH
 import ai.devchat.common.DevChatBundle
 import ai.devchat.storage.DevChatState
 import ai.devchat.storage.ToolWindowState
-import ai.grazie.utils.applyIf
 import com.intellij.openapi.application.runInEdt
 import com.intellij.openapi.wm.ToolWindowManager
 import com.intellij.openapi.wm.ex.ToolWindowManagerListener
@@ -15,13 +14,12 @@ class ToolWindowStateListener : ToolWindowManagerListener {
         super.toolWindowsRegistered(ids, toolWindowManager)
         ids.find { it == ASSISTANT_NAME_ZH }?.let {
             runInEdt {
-                toolWindowManager.getToolWindow(it)?.applyIf(
-                    DevChatState.instance.lastToolWindowState == ToolWindowState.SHOWN.name
-                ) {
-                    while (!this.isAvailable) {
+                val toolWindow = toolWindowManager.getToolWindow(it)
+                if (DevChatState.instance.lastToolWindowState == ToolWindowState.SHOWN.name && toolWindow != null) {
+                    while (!toolWindow.isAvailable) {
                         Thread.sleep(1000)
                     }
-                    this.show()
+                    toolWindow.show()
                 }
             }
         }