Sanitize chat messages to render in Obsidian, Desktop, Web apps

Use DOMPurify to escape any unsafe HTML in chat message before adding
it to DOM via innerHTML updates to a HTML element

src/interface/obsidian/package.json

@@ -17,6 +17,7 @@
         "assistant"
     ],
     "devDependencies": {
+        "@types/dompurify": "^3.0.5",
         "@types/node": "^16.11.6",
         "@typescript-eslint/eslint-plugin": "5.29.0",
         "@typescript-eslint/parser": "5.29.0",
@@ -25,5 +26,8 @@
         "obsidian": "latest",
         "tslib": "2.4.0",
         "typescript": "4.7.4"
+    },
+    "dependencies": {
+        "dompurify": "^3.1.4"
     }
 }