refactor: Clean up unused imports and update warning widget layout

Author: ethanyhou

com.microsoft.copilot.eclipse.ui/META-INF/MANIFEST.MF

@@ -31,8 +31,7 @@ Require-Bundle: com.microsoft.copilot.eclipse.core;bundle-version="0.15.0",
  org.eclipse.ui.editors;bundle-version="3.17.100",
  org.eclipse.ui;bundle-version="3.205.0",
  org.eclipse.ui.navigator;bundle-version="3.12.200",
- org.eclipse.jface.text;bundle-version="3.24.200",
- org.eclipse.jface.notifications;bundle-version="0.7.0",
+ org.eclipse.jface.text;bundle-version="3.24.200", 
  org.eclipse.core.runtime;bundle-version="[3.30.0,4.0.0)",
  org.eclipse.core.expressions,
  org.eclipse.jdt.annotation;resolution:=optional,

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/BaseTurnWidget.java

@@ -573,7 +573,7 @@ protected void createWarnDialog(String message, int code, String modelProviderNa
     if (code == 402 && !byokQuotaExceeded) {
       planForActions = this.serviceManager.getAuthStatusManager().getQuotaStatus().copilotPlan();
     }
-    new WarnWidget(this, SWT.BOTTOM, displayMessage, planForActions);
+    new WarnWidget(this, SWT.NONE, displayMessage, planForActions);
     requestLayout();
   }
 

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ChatContentViewer.java

@@ -27,16 +27,13 @@
 import com.microsoft.copilot.eclipse.core.lsp.protocol.AgentRound;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.AgentToolCall;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ChatProgressValue;
-import com.microsoft.copilot.eclipse.core.lsp.protocol.CopilotModel;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.TodoItem;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ToolSpecificData;
-import com.microsoft.copilot.eclipse.core.lsp.protocol.quota.CopilotPlan;
 import com.microsoft.copilot.eclipse.ui.CopilotUi;
 import com.microsoft.copilot.eclipse.ui.chat.services.ChatServiceManager;
 import com.microsoft.copilot.eclipse.ui.chat.services.TodoListService;
 import com.microsoft.copilot.eclipse.ui.i18n.Messages;
 import com.microsoft.copilot.eclipse.ui.swt.CssConstants;
-import com.microsoft.copilot.eclipse.ui.utils.MenuUtils;
 import com.microsoft.copilot.eclipse.ui.utils.SwtUtils;
 
 /**

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/Messages.java

@@ -152,14 +152,10 @@ public final class Messages extends NLS {
   public static String chat_addContext_tooltip;
   public static String chat_filePicker_title;
   public static String chat_filePicker_message;
-  public static String chat_noQuotaView_fallbackModel;
-  public static String chat_noQuotaView_updatePlanButton;
   public static String chat_noQuotaView_updatePlanButton_Tooltip;
   public static String chat_noQuotaView_enableAdditionalUsageButton;
   public static String chat_noQuotaView_enableAdditionalUsageButton_tooltip;
   public static String chat_noQuotaView_viewYourPlanButton_Tooltip;
-  public static String chat_noQuotaView_proProplusWarnMsg;
-  public static String chat_noQuotaView_cbCeWarnMsg;
   public static String chat_currentReferencedFile_description;
   public static String chat_turnWidget_copilot;
   public static String chat_turnWidget_user;

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/messages.properties

@@ -133,14 +133,10 @@ chat_agentModeView_configureMcpSuffix=to configure MCP server
 chat_agentModeView_attachContextSuffix=to attach context
 chat_loadingView_title=Loading
 chat_loadingView_description=Initializing Copilot...
-chat_noQuotaView_fallbackModel=fallback model
-chat_noQuotaView_updatePlanButton=Upgrade Plan
 chat_noQuotaView_updatePlanButton_Tooltip=Upgrade your Copilot plan
 chat_noQuotaView_enableAdditionalUsageButton=Enable Additional Usage
 chat_noQuotaView_enableAdditionalUsageButton_tooltip=Pay-as-you-go usage of additional AI credits once you run out of your included usage. Set a budget to cap your maximum monthly spend.
 chat_noQuotaView_viewYourPlanButton_Tooltip=View your Copilot plan
-chat_noQuotaView_proProplusWarnMsg=You have exceeded your premium request allowance. We have automatically switched you to **%s** which is included with your plan. [Enable additional paid premium requests](https://aka.ms/github-copilot-manage-overage) to continue using premium models.
-chat_noQuotaView_cbCeWarnMsg=You have exceeded your free request allowance. We have automatically switched you to **%s** which is included with your plan. To enable additional paid premium requests, contact your organization admin.
 chat_noAuthView_title=No Copilot subscription found
 chat_noAuthView_description=Request a license from your organization manager or sign up for a 60 day trial
 chat_noAuthView_checkSubButton=Check subscription plans
@@ -208,7 +204,6 @@ model_hover_contextWindow=Context Window:
 model_hover_cost=Cost:
 chat_actionBar_modePicker_Tooltip=Set Agents
 chat_actionBar_modelPicker_Tooltip=Pick Model{0}
-
 context_window_title=Context Window
 context_window_tokens={0} / {1} tokens
 context_window_system=System