Initial commit: Memind H5 portal with MindSpace, Plaza, and agent jobs.

Track application source and tests; exclude local env, user workspaces, and runtime data via .gitignore.

Co-authored-by: Cursor <cursoragent@cursor.com>

message-stream.mjs

@@ -0,0 +1,66 @@
+/**
+ * Merge streaming assistant chunks from SSE Message events.
+ * Upstream may send deltas, cumulative snapshots, or multi-part content arrays.
+ */
+export function mergeStreamingChunk(previous, incoming) {
+  const prev = String(previous ?? '');
+  const next = String(incoming ?? '');
+  if (!next) return prev;
+  if (!prev) return next;
+  if (next === prev) return prev;
+  if (next.startsWith(prev)) return next;
+  if (prev.startsWith(next)) return prev;
+  if (prev.endsWith(next)) return prev;
+
+  const maxOverlap = Math.min(prev.length, next.length);
+  for (let size = maxOverlap; size > 0; size -= 1) {
+    if (prev.endsWith(next.slice(0, size))) {
+      return prev + next.slice(size);
+    }
+  }
+
+  return prev + next;
+}
+
+function findLastContentIndex(content, type) {
+  for (let index = content.length - 1; index >= 0; index -= 1) {
+    if (content[index]?.type === type) return index;
+  }
+  return -1;
+}
+
+function mergeTextLikeBlock(block, incomingValue, field) {
+  block[field] = mergeStreamingChunk(block[field], incomingValue);
+}
+
+export function mergeMessageContent(existingContent, incomingContent) {
+  const merged = [...existingContent];
+
+  for (const item of incomingContent) {
+    if (item.type === 'text') {
+      const index = findLastContentIndex(merged, 'text');
+      if (index >= 0) {
+        mergeTextLikeBlock(merged[index], item.text, 'text');
+        continue;
+      }
+      merged.push({ ...item });
+      continue;
+    }
+
+    if (item.type === 'thinking') {
+      const index = findLastContentIndex(merged, 'thinking');
+      if (index >= 0) {
+        mergeTextLikeBlock(merged[index], item.thinking, 'thinking');
+        continue;
+      }
+      merged.push({ ...item });
+      continue;
+    }
+
+    const tail = merged[merged.length - 1];
+    if (tail && JSON.stringify(tail) === JSON.stringify(item)) continue;
+    merged.push({ ...item });
+  }
+
+  return merged;
+}