Improve the formatting of tool calls, show thinking, treat Reasoning and Thinking as the same thing (sorry Kant) (#7626)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -670,8 +670,6 @@ export type MessageContent = (TextContent & {
     type: 'redactedThinking';
 }) | (SystemNotificationContent & {
     type: 'systemNotification';
-}) | (ReasoningContent & {
-    type: 'reasoning';
 });
 
 export type MessageEvent = {
@@ -1009,10 +1007,6 @@ export type ReadResourceResponse = {
     uri: string;
 };
 
-export type ReasoningContent = {
-    text: string;
-};
-
 export type Recipe = {
     activities?: Array<string> | null;
     author?: Author | null;