ctx_management: summarize on command button (#2479)

ui/desktop/src/api/types.gen.ts

@@ -196,6 +196,8 @@ export type MessageContent = (TextContent & {
     type: 'redactedThinking';
 }) | (ContextLengthExceeded & {
     type: 'contextLengthExceeded';
+}) | (SummarizationRequested & {
+    type: 'summarizationRequested';
 });
 
 /**
@@ -360,6 +362,10 @@ export type SessionMetadata = {
     working_dir: string;
 };
 
+export type SummarizationRequested = {
+    msg: string;
+};
+
 export type TextContent = {
     annotations?: Annotations | null;
     text: string;