feat: add test excalidraw page with deep linking support

- Added new test excalidraw page component and route with deep linking via ?tests=excalidraw
- Enhanced drawings editor to preserve frontmatter and normalize metadata when saving .excalidraw.md files
- Improved excalidraw file handling with better error handling and sanitization
- Updated sidebar and navigation to include test excalidraw option
- Fixed collaborators map serialization issue in excalidraw scene data

vault/.obsidian/workspace.json

@@ -4,19 +4,17 @@
     "type": "split",
     "children": [
       {
-        "id": "22c2ec9062224eb0",
+        "id": "b123bf2cfbaf681c",
         "type": "tabs",
         "children": [
           {
-            "id": "9ad6b7932a502fb2",
+            "id": "a71c9cf3bbb86552",
             "type": "leaf",
             "state": {
-              "type": "excalidraw",
-              "state": {
-                "file": "Drawing 2025-10-27 16.43.48.excalidraw.md"
-              },
-              "icon": "excalidraw-icon",
-              "title": "Drawing 2025-10-27 16.43.48.excalidraw"
+              "type": "empty",
+              "state": {},
+              "icon": "lucide-file",
+              "title": "New tab"
             }
           }
         ]
@@ -161,7 +159,8 @@
       }
     ],
     "direction": "horizontal",
-    "width": 234.5
+    "width": 200,
+    "collapsed": true
   },
   "left-ribbon": {
     "hiddenItems": {
@@ -175,32 +174,43 @@
       "obsidian-excalidraw-plugin:New drawing": false
     }
   },
-  "active": "9ad6b7932a502fb2",
+  "active": "a71c9cf3bbb86552",
   "lastOpenFiles": [
-    "Drawing 2025-10-27 16.43.48.excalidraw.md.tmp",
-    "Drawing 2025-10-27 16.43.48.excalidraw.md.bak",
-    "test-drawing.excalidraw.md",
-    "Drawing 2025-10-27 16.43.48.excalidraw.md",
-    "Untitled.canvas",
-    "test.md",
+    "dessin_05.excalidraw.md",
+    "dessin_03.excalidraw.md",
+    "dessin_05.excalidraw.md.bak",
+    "dessin_04.excalidraw.md.tmp",
+    "dessin_04.excalidraw.md.bak",
+    "dessin_04.excalidraw.md",
+    "dessin-002.excalidraw.md",
+    "dessin_03.excalidraw.md.tmp",
+    "dessin_03.excalidraw.md.bak",
+    "dessin-002.excalidraw.md.tmp",
+    "dessin-002.excalidraw.md.bak",
+    "Dessin_001.excalidraw.md",
+    "Dessin_001.excalidraw.md.tmp",
+    "Dessin_001.excalidraw.md.bak",
+    "Drawing 2025-10-28 11.11.59.excalidraw.md",
+    "Drawing 2025-10-28 11.11.59.excalidraw.md.tmp",
+    "dessin-06.excalidraw.md",
+    "Dessin-5.excalidraw.md",
+    "Drawing-20251027-2203.excalidraw.md",
+    "dessin-04.excalidraw.md",
+    "Drawing-20251027-2201.excalidraw.md",
+    "Dessin-03.md.excalidraw.md",
+    "Dessin-01.excalidraw.md",
+    "Drawing 2025-10-27 19.22.35.excalidraw.md",
+    "Nouveau-markdown.md",
+    "Drawing-20251027-1922.excalidraw.md",
+    "Nouvelle note 16.md",
+    "Dessin.excalidraw.md",
+    "Dessin.excalidraw.restored.md",
     "HOME.md",
-    "folder1/test2.md",
-    "folder2/test2.md",
-    "folder2",
-    "folder1",
-    "NonExistentNote.md",
-    "tata/titi-coco.md",
-    "folder/test2.md",
-    "Fichier_not_found.png.md",
-    "welcome.md",
-    "tata/briana/test-todo.md",
-    "titi/tata-coco.md",
-    "tata/briana/test-table.md",
-    "tata/briana/test-note-1.md",
-    "tata/briana/test-code.md",
-    "deep/path/test3.md",
-    "deep/path",
-    "deep",
-    "folder"
+    "Drawing-20251027-1914.excalidraw.md",
+    "Drawing-20251027-1705.excalidraw.md",
+    "Drawing 2025-10-27 16.43.48.excalidraw.md",
+    "test-drawing.excalidraw.md",
+    "Untitled.canvas",
+    "test.md"
   ]
 }