Add InputDeviceIconSetSO configuration guide and related documentation

- Created a new markdown file detailing the configuration of InputDeviceIconSetSO.
- Included sections on system architecture, field explanations, image specifications, and complete workflow from setup to runtime.
- Documented the automatic device recognition logic and provided troubleshooting for common issues.
- Added references to relevant files and scripts for easier navigation.

Assets/_Game/Scripts/Editor/UIToolkit/Editor.uss

@@ -259,3 +259,113 @@
     background-color: rgba(200, 80, 80, 0.20);
     border-color: rgba(220, 100, 100, 0.80);
 }
+
+/* ── Input Icon Studio 专用样式 ─────────────────────────────
+   用于 InputIconStudioWindow 和 InputDeviceIconSetSOEditor    */
+
+/* 图标缩略图（32px 正方形，带圆角 + 深色背景，ScaleToFit）*/
+.icon-thumbnail {
+    width: 32px;
+    height: 32px;
+    border-radius: 3px;
+    background-color: rgba(0, 0, 0, 0.22);
+    flex-shrink: 0;
+    margin-left: 4px;
+}
+
+/* 大图预览（64px，用于当前 Action 图标展示）*/
+.icon-preview-large {
+    width: 64px;
+    height: 64px;
+    border-radius: 4px;
+    background-color: rgba(0, 0, 0, 0.25);
+    border-width: 1px;
+    border-color: rgba(128, 128, 128, 0.22);
+    flex-shrink: 0;
+    margin-left: 12px;
+}
+
+/* 覆盖率指示点：绿（已配置） */
+.coverage-dot--ok {
+    color: rgba(60, 200, 90, 1.0);
+    font-size: 10px;
+    width: 14px;
+    flex-shrink: 0;
+}
+
+/* 覆盖率指示点：红（未配置） */
+.coverage-dot--missing {
+    color: rgba(210, 65, 65, 1.0);
+    font-size: 10px;
+    width: 14px;
+    flex-shrink: 0;
+}
+
+/* 交互提示模拟预览容器（仿 InteractPromptWidget 外观）*/
+.prompt-preview {
+    flex-direction: row;
+    align-items: center;
+    align-self: flex-start;
+    padding: 8px 14px 8px 12px;
+    margin-top: 4px;
+    margin-left: 8px;
+    border-radius: 6px;
+    background-color: rgba(20, 20, 26, 0.85);
+    border-width: 1px;
+    border-color: rgba(130, 130, 155, 0.35);
+}
+
+/* 模拟预览中的按键图标方框 */
+.prompt-key-box {
+    width: 32px;
+    height: 32px;
+    border-radius: 4px;
+    background-color: rgba(50, 50, 64, 0.90);
+    border-width: 1px;
+    border-color: rgba(160, 160, 185, 0.50);
+    justify-content: center;
+    align-items: center;
+    flex-shrink: 0;
+    margin-right: 10px;
+}
+
+/* Action 列表行（Input Icon Studio 左列） */
+.action-list-row {
+    flex-direction: row;
+    align-items: center;
+    padding: 5px 8px 5px 10px;
+    margin-bottom: 1px;
+    border-radius: 0;
+    border-width: 0;
+}
+.action-list-row:hover {
+    background-color: rgba(128, 128, 128, 0.10);
+}
+.action-list-row--selected {
+    background-color: rgba(90, 140, 220, 0.20);
+}
+
+/* 设备徽章（四色：键鼠蓝 / Xbox绿 / PS深蓝 / Switch红） */
+.device-badge {
+    font-size: 10px;
+    padding: 2px 7px;
+    border-radius: 4px;
+    border-width: 1px;
+    -unity-font-style: bold;
+}
+.device-badge--kbm {
+    background-color: rgba(50, 100, 180, 0.50);
+    border-color: rgba(90, 150, 240, 0.60);
+}
+.device-badge--xbox {
+    background-color: rgba(25, 130, 40, 0.50);
+    border-color: rgba(60, 185, 80, 0.60);
+}
+.device-badge--ps {
+    background-color: rgba(25, 65, 165, 0.50);
+    border-color: rgba(60, 110, 230, 0.60);
+}
+.device-badge--switch {
+    background-color: rgba(190, 40, 50, 0.50);
+    border-color: rgba(230, 80, 90, 0.60);
+}