refactor: 优化 ICHelperPanel 组件结构

- 将 1346 行的单文件拆分为 7 个职责单一的模块
   - authHelper: 认证和登录检查
   - userInfoHelper: 用户信息管理
   - conversationHelper: 会话历史加载
   - vcdHelper: VCD 文件处理
   - contextHelper: 上下文管理
   - fileHelper: 文件操作
   - messageRouter: 消息路由分发
   - 主组件精简至 157 行，提升可维护性

src/panels/helpers/vcdHelper.ts

@@ -0,0 +1,158 @@
+/**
+ * VCD 文件处理模块
+ * 功能：VCD 文件信息获取和信号解析
+ * 依赖：vscode, fs
+ * 使用场景：波形查看器相关功能
+ */
+import * as vscode from "vscode";
+
+export async function getVCDFileInfo(
+  panel: vscode.WebviewPanel,
+  vcdFilePath: string,
+  containerId: string,
+) {
+  try {
+    const fs = require("fs");
+
+    if (!fs.existsSync(vcdFilePath)) {
+      panel.webview.postMessage({
+        command: "vcdInfo",
+        containerId: containerId,
+        vcdInfo: {
+          signalCount: "N/A",
+          timeRange: "N/A",
+          fileSize: "N/A",
+          error: "文件不存在",
+        },
+      });
+      return;
+    }
+
+    const stats = fs.statSync(vcdFilePath);
+    const fileSizeKB = stats.size / 1024;
+    const fileSize =
+      fileSizeKB < 1024
+        ? `${fileSizeKB.toFixed(2)} KB`
+        : `${(fileSizeKB / 1024).toFixed(2)} MB`;
+
+    const content = fs.readFileSync(vcdFilePath, "utf-8");
+    const varMatches = content.match(/\$var/g);
+    const signalCount = varMatches ? varMatches.length : 0;
+
+    let timeRange = "N/A";
+    const timeMatch = content.match(/#(\d+)/g);
+    if (timeMatch && timeMatch.length > 0) {
+      const times = timeMatch.map((t: string) => parseInt(t.substring(1)));
+      const minTime = Math.min(...times);
+      const maxTime = Math.max(...times);
+      timeRange = `${minTime} - ${maxTime}`;
+    }
+
+    const signals = parseVCDSignals(content, 3);
+
+    panel.webview.postMessage({
+      command: "vcdInfo",
+      containerId: containerId,
+      vcdInfo: {
+        signalCount: signalCount.toString(),
+        timeRange: timeRange,
+        fileSize: fileSize,
+        signals: signals,
+      },
+    });
+  } catch (error) {
+    console.error("获取 VCD 文件信息失败:", error);
+    panel.webview.postMessage({
+      command: "vcdInfo",
+      containerId: containerId,
+      vcdInfo: {
+        signalCount: "N/A",
+        timeRange: "N/A",
+        fileSize: "N/A",
+        error: error instanceof Error ? error.message : "未知错误",
+      },
+    });
+  }
+}
+
+function parseVCDSignals(content: string, maxSignals: number = 3) {
+  const signals: Array<{
+    name: string;
+    identifier: string;
+    width: number;
+    values: Array<{ time: number; value: string }>;
+  }> = [];
+
+  try {
+    const varRegex = /\$var\s+(\w+)\s+(\d+)\s+(\S+)\s+([^\$]+?)\s+\$end/g;
+    let match;
+    const signalDefs: Array<{
+      name: string;
+      identifier: string;
+      width: number;
+    }> = [];
+
+    while (
+      (match = varRegex.exec(content)) !== null &&
+      signalDefs.length < maxSignals
+    ) {
+      const width = parseInt(match[2]);
+      const identifier = match[3];
+      const name = match[4].trim();
+      signalDefs.push({ name, identifier, width });
+    }
+
+    const dumpvarsIndex = content.indexOf("$dumpvars");
+    if (dumpvarsIndex === -1) {
+      return signals;
+    }
+
+    const dataSection = content.substring(dumpvarsIndex);
+
+    for (const signalDef of signalDefs) {
+      const values: Array<{ time: number; value: string }> = [];
+      let currentTime = 0;
+      const lines = dataSection.split("\n");
+
+      for (const line of lines) {
+        const trimmedLine = line.trim();
+
+        if (trimmedLine.startsWith("#")) {
+          currentTime = parseInt(trimmedLine.substring(1));
+          continue;
+        }
+
+        if (signalDef.width === 1) {
+          const singleBitMatch = trimmedLine.match(
+            new RegExp(`^([01xz])${signalDef.identifier}$`),
+          );
+          if (singleBitMatch) {
+            values.push({ time: currentTime, value: singleBitMatch[1] });
+          }
+        } else {
+          const multiBitMatch = trimmedLine.match(
+            new RegExp(`^b([01xz]+)\\s+${signalDef.identifier}$`),
+          );
+          if (multiBitMatch) {
+            values.push({ time: currentTime, value: multiBitMatch[1] });
+          }
+        }
+
+        if (values.length >= 50) {
+          break;
+        }
+      }
+
+      signals.push({
+        name: signalDef.name,
+        identifier: signalDef.identifier,
+        width: signalDef.width,
+        values: values,
+      });
+    }
+  } catch (error) {
+    console.error("解析 VCD 信号数据失败:", error);
+  }
+
+  return signals;
+}