Add ToolRenderResult interface for custom tool rendering

- Changed ToolRenderer return type from TemplateResult to ToolRenderResult
- ToolRenderResult = { content: TemplateResult, isCustom: boolean }
- isCustom: true = no card wrapper, false = wrap in card
- Updated all existing tool renderers to return new format
- Updated Messages.ts to handle custom rendering

This enables tools to render without default card chrome when needed.

packages/web-ui/src/agent/transports/AppTransport.ts

@@ -1,12 +1,12 @@
 import type {
 	AgentContext,
+	AgentLoopConfig,
 	Api,
 	AssistantMessage,
 	AssistantMessageEvent,
 	Context,
 	Message,
 	Model,
-	PromptConfig,
 	SimpleStreamOptions,
 	ToolCall,
 	UserMessage,
@@ -348,9 +348,10 @@ export class AppTransport implements AgentTransport {
 			tools: cfg.tools,
 		};
 
-		const pc: PromptConfig = {
+		const pc: AgentLoopConfig = {
 			model: cfg.model,
 			reasoning: cfg.reasoning,
+			getQueuedMessages: cfg.getQueuedMessages,
 		};
 
 		// Yield events from the upstream agentLoop iterator