feat: 群日报 9 宫格头像自动反推 + 持续时长语义 + 自动登录

- group-report-service: enrichAvatarsFromGroup 从群成员快照反推真头像
  - group-report-service: 修 SVG data URL 正则,fallback 现在能正常嵌入
  - group-report (shared): GroupReportMetadata/Result 加 talker/warnings 字段
  - timeSpan 改为持续时长(\"1 h\" / \"30 min\" / \"2 d\" 紧凑半角)
  - App.tsx 启动自动连接(env var + safeStorage)
  - Wcdb4Client 父目录自动解析为最新 wxid
  - HTTP server EADDRINUSE 友好提示 + 指数退避
  - installSafeConsole 修 EPIPE crash
  - SettingsPanel 测试连接后自动更新 dbRoot

src/renderer/src/assets/main.css

@@ -1273,6 +1273,55 @@ body {
   flex-shrink: 0;
 }
 
+/* 启动自动连接 Splash */
+.boot-splash {
+  position: fixed;
+  inset: 0;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 14px;
+  background: linear-gradient(180deg, #f5f7f8 0%, #eceff1 100%);
+  z-index: 2000;
+  animation: boot-splash-fade-in 0.2s ease-out;
+}
+
+@keyframes boot-splash-fade-in {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+.boot-splash-spinner {
+  width: 36px;
+  height: 36px;
+  border-radius: 50%;
+  border: 3px solid rgba(7, 193, 96, 0.18);
+  border-top-color: #07c160;
+  animation: boot-splash-spin 0.9s linear infinite;
+}
+
+@keyframes boot-splash-spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.boot-splash-title {
+  font-size: 15px;
+  font-weight: 500;
+  color: #1f2429;
+}
+
+.boot-splash-subtitle {
+  font-size: 12px;
+  color: #6f767c;
+}
+
 /* 设置面板 */
 .settings-overlay {
   position: fixed;