fix: wrap executeActionsWithLoop in try/catch to prevent raw 500 errors

When the AI Gateway returns a non-200 (e.g. tool validation failure),
callWebhook throws an unhandled Error that bubbled up to Slim as a raw
500 page. Now caught gracefully with a Hebrew error message returned
to the user instead of "Slim Application Error".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

manifest.json

@@ -3,7 +3,7 @@
     "module": "SmartAssistant",
     "description": "Unified AI Assistant for Legal CRM — floating chat with case memory, office alerts, and AI Gateway integration",
     "author": "klear",
-    "version": "2.7.0",
+    "version": "2.7.1",
     "acceptableVersions": [
         ">=8.0.0"
     ],