feat(copilot+canvas rendering): add context window tracking to copilot and selectively render canvas components (#1622)

* Copilot context window

* Fix pill

* Speed up canvas

* Fix react hook bug

* Context pill div

apps/sim/app/api/copilot/chat/route.ts

@@ -463,6 +463,8 @@ export async function POST(req: NextRequest) {
             logger.debug(`[${tracker.requestId}] Sent initial chatId event to client`)
           }
 
+          // Note: context_usage events are forwarded from sim-agent (which has accurate token counts)
+
           // Start title generation in parallel if needed
           if (actualChatId && !currentChat?.title && conversationHistory.length === 0) {
             generateChatTitle(message)
@@ -594,6 +596,7 @@ export async function POST(req: NextRequest) {
                             lastSafeDoneResponseId = responseIdFromDone
                           }
                         }
+                        // Note: context_usage events are forwarded from sim-agent
                         break
 
                       case 'error':