feat(excalidraw): support .excalidraw.md (Obsidian plugin format) with lz-string decompression

frontend/js/utils.js

@@ -80,6 +80,7 @@ const EXT_ICONS = {
   ".csv": "table",
   ".tsv": "table",
   ".excalidraw": "pen-tool",
+  ".excalidraw.md": "pen-tool",
   ".sql": "database",
   ".db": "database",
   ".sqlite": "database",
@@ -206,6 +207,10 @@ const EXT_ICONS = {
 };
 
 function getFileIcon(name) {
+  const lower = name.toLowerCase();
+  // Check for double extensions first (e.g., .excalidraw.md)
+  if (lower.endsWith(".excalidraw.md")) return EXT_ICONS[".excalidraw.md"] || "pen-tool";
+  if (lower.endsWith(".md.excalidraw")) return EXT_ICONS[".excalidraw"] || "pen-tool";
   const ext = "." + name.split(".").pop().toLowerCase();
   return EXT_ICONS[ext] || "file";
 }