Handle FinishReason.NO_IMAGE and fix optional chaining

- Add NO_IMAGE to error finish reasons in Google provider
- Fix non-null assertion after optional chaining in Anthropic provider
- Migrate biome config to 2.3.5
- Ignore Tailwind CSS file from biome checks
- Bump all packages to version 0.6.0

packages/agent/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@mariozechner/pi-agent",
-	"version": "0.5.48",
+	"version": "0.6.0",
 	"description": "General-purpose agent with transport abstraction, state management, and attachment support",
 	"type": "module",
 	"main": "./dist/index.js",
@@ -19,7 +19,7 @@
 	},
 	"dependencies": {
 		"@mariozechner/pi-ai": "^0.5.44",
-		"@mariozechner/pi-tui": "^0.5.48"
+		"@mariozechner/pi-tui": "^0.6.0"
 	},
 	"keywords": [
 		"ai",