feat: show expandable tool call details in chat activity panel

Thread toolArguments from the sidecar through shared contracts, main-process pipeline, and into the renderer. Add ToolCallDetailPanel with inline summaries (command, path, pattern, etc.) and expandable argument details for every tool-call event in the activity timeline.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/AryxAppService.ts

@@ -2543,6 +2543,7 @@ export class AryxAppService extends EventEmitter<AppServiceEvents> {
           sourceAgentName: event.sourceAgentName,
           toolName: event.toolName,
           toolCallId: event.toolCallId,
+          toolArguments: event.toolArguments,
           fileChanges: event.fileChanges,
         }));
     }
@@ -2563,6 +2564,7 @@ export class AryxAppService extends EventEmitter<AppServiceEvents> {
       sourceAgentName: event.sourceAgentName,
       toolName: event.toolName,
       toolCallId: event.toolCallId,
+      toolArguments: event.toolArguments,
       fileChanges: event.fileChanges,
     });
   }