feat:优化IC Coder页面展示

- 优化了字体颜色
- 优化了字体大小等

src/views/inputArea.ts

@@ -103,7 +103,7 @@ export function getInputAreaStyles(): string {
     /* 居中模式：未发起对话时 */
     .input-area.centered {
       position: absolute;
-      top: 55%;
+      top: 60%;
       left: 50%;
       transform: translate(-50%, -50%);
       width: calc(100% - 40px);

src/views/webviewContent.ts

@@ -73,7 +73,10 @@ export function getWebviewContent(
       display: none;
     }
     .header h1 {
-      color: var(--vscode-button-background);
+      background: linear-gradient(to right, #4A9EFF, #7CB8FF, #A8D0FF);
+      -webkit-background-clip: text;
+      -webkit-text-fill-color: transparent;
+      background-clip: text;
       margin: 0 0 8px 0;
     }
     .chat-container {
@@ -396,11 +399,11 @@ export function getWebviewContent(
   ${getConversationHistoryBarContent()}
   ${getProgressBarContent()}
   <div class="header">
-    <div style="display: flex; align-items: center; justify-content: center; gap: 10px;">
-      <img src="${iconUri}" alt="IC Coder" style="width: 28px; height: 28px;" />
-      <h1 style="margin: 0;">IC Coder</h1>
+    <div style="display: flex; align-items: center; justify-content: center; gap: 15px;">
+      <img src="${iconUri}" alt="IC Coder" style="width: 48px; height: 48px;" />
+      <h1 style="margin: 0; font-size: 36px;">IC Coder</h1>
     </div>
-    <p>专注于真实FPGA研发的Verilog智能体编程平台</p>
+    <p style="font-size: 16px; margin-top: 12px;">专注于真实FPGA研发的Verilog智能体编程平台</p>
   </div>
 
   <div class="chat-container">