fix:新增功能并优化

thumb-renderer.js

@@ -1,12 +1,7 @@
-/**
- * One-off WebGL capture: try multiple iTime values, pick a non-degenerate frame (avoid flat black/white),
- * export PNG, then loseContext.
- */
 (function () {
   const THUMB_W = 512;
   const THUMB_H = 320;
 
-  /** 首帧常为过黑/过白/无对比时，在这些时刻采样并打分选帧 */
   const THUMB_TIME_CANDIDATES = [
     0, 0.1, 0.22, 0.45, 0.78, 1.15, 1.7, 2.25, 2.85, 3.45, 4.2, 5.1, 6.28, 7.5, 9, 11, 13,
   ];
@@ -276,11 +271,6 @@ void main() { mainImage(outColor, gl_FragCoord.xy); }`;
     return varL * 85 + (1 - Math.abs(mean - 0.4) * 1.05);
   }
 
-  /**
-   * @param {string} code — normalized GLSL (same as server returns)
-   * @param {string} name — shader title for fallback hash
-   * @returns {Promise<string>} data:image/png;base64,...
-   */
   window.captureShaderThumbnail = function captureShaderThumbnail(code, name) {
     const canvas = document.createElement("canvas");
     canvas.width = THUMB_W;