feat(frontends,ui): opus 5.5 progress updates show in the web panel and the vault transcript

ui/src/lib/panel/activity.svelte.ts

@@ -233,8 +233,10 @@ export class ActivityModel {
     }
     if (sdk.type === "content_block_delta" && parent === null) {
       const delta = sdk.delta as Record<string, unknown> | undefined;
-      if (delta?.type === "text_delta" && typeof delta.text === "string") {
-        turn.text = joinText(turn.text, delta.text, turn.paused);
+      const text =
+        delta?.type === "thinking_delta" ? delta.thinking : delta?.text;
+      if (typeof text === "string" && text) {
+        turn.text = joinText(turn.text, text, turn.paused);
         turn.paused = false;
       }
     }