Replace token estimation with using last API response token usage

package.json

@@ -134,7 +134,6 @@
   "dependencies": {
     "@anthropic-ai/bedrock-sdk": "^0.10.2",
     "@anthropic-ai/sdk": "^0.26.0",
-    "@anthropic-ai/tokenizer": "^0.0.4",
     "@anthropic-ai/vertex-sdk": "^0.4.1",
     "@types/clone-deep": "^4.0.4",
     "@vscode/codicons": "^0.0.36",
@@ -145,7 +144,6 @@
     "diff": "^5.2.0",
     "execa": "^9.3.0",
     "globby": "^14.0.2",
-    "image-size": "^1.1.1",
     "openai": "^4.54.0",
     "os-name": "^6.0.0",
     "p-wait-for": "^5.0.2",