fix: treat unicode with iter instead of length

packages/shared/src/contracts/editorAgent.ts

@@ -7,10 +7,7 @@ export const EDITOR_AGENT_ERROR_MESSAGE_PREFIX = 'ERROR ';
 export type EditorAgentMessageRole = 'user' | 'assistant' | 'system';
 
 export type EditorAgentToolCallStatus =
-  | 'not_completed'
-  | 'completed'
-  | 'failed'
-  | 'cancelled';
+  'not_completed' | 'completed' | 'failed' | 'cancelled';
 
 export type EditorAgentAttachmentSource = 'canvas_resource' | 'library_asset';
 
@@ -24,7 +21,10 @@ function isUnsafeEditorAgentAttachmentLabelCharacter(character: string) {
     (codePoint >= 0x5b && codePoint <= 0x60) ||
     (codePoint >= 0x7b && codePoint <= 0x7e);
   const isUnsafeAsciiPunctuation =
-    isAsciiPunctuation && character !== '-' && character !== '_' && character !== '.';
+    isAsciiPunctuation &&
+    character !== '-' &&
+    character !== '_' &&
+    character !== '.';
   return isControlCharacter || isUnsafeAsciiPunctuation;
 }
 
@@ -34,6 +34,7 @@ function normalizeEditorAgentAttachmentLabel(
 ) {
   const normalizeCandidate = (candidate: string | null | undefined) => {
     const normalized: string[] = [];
+    let codePoints = 0;
     let pendingSpace = false;
     for (const character of candidate?.trim() ?? '') {
       if (isUnsafeEditorAgentAttachmentLabelCharacter(character)) {
@@ -45,18 +46,17 @@ function normalizeEditorAgentAttachmentLabel(
       }
       if (
         pendingSpace &&
-        normalized.length + 1 <
-          EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS
+        codePoints + 1 < EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS
       ) {
         normalized.push(' ');
+        codePoints += 1;
       }
       pendingSpace = false;
-      if (
-        normalized.length >= EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS
-      ) {
+      if (codePoints >= EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS) {
         break;
       }
       normalized.push(character);
+      codePoints += 1;
     }
     return normalized.join('').trim();
   };