fix: true SSE streaming via fetch instead of requestUrl

Replaces the buffered requestUrl call with native fetch + ReadableStream
so text chunks are yielded incrementally as they arrive. The ChatView
streaming loop is unchanged — it already handles chunks correctly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.js

@@ -32728,30 +32728,65 @@ var ClaudeClient = class {
       "anthropic-version": "2023-06-01"
     };
   }
-  /**
-   * "Stream" a chat completion via requestUrl (no real streaming — CORS blocks
-   * native fetch from app://obsidian.md). Yields the full response as a single
-   * text chunk so ChatView's streaming loop keeps working unchanged.
-   */
+  /** Stream a chat completion via fetch + SSE, yielding text chunks as they arrive. */
   async *streamChat(messages, options) {
-    const response = await (0, import_obsidian2.requestUrl)({
-      url: this.baseUrl,
+    let response;
+    try {
+      response = await fetch(this.baseUrl, {
         method: "POST",
         headers: this.headers(options.apiKey),
         body: JSON.stringify({
           model: options.model,
           max_tokens: options.maxTokens ?? 8192,
           system: options.systemPrompt,
-        messages
-      }),
-      throw: false
+          messages,
+          stream: true
+        })
       });
-    if (response.status >= 400) {
-      yield { type: "error", error: `API Error ${response.status}: ${response.text}` };
+    } catch (e) {
+      yield { type: "error", error: e.message };
       return;
     }
-    const text = response.json.content?.[0]?.text ?? "";
-    yield { type: "text", text };
+    if (!response.ok) {
+      const text = await response.text();
+      yield { type: "error", error: `API Error ${response.status}: ${text}` };
+      return;
+    }
+    const reader = response.body?.getReader();
+    if (!reader) {
+      yield { type: "error", error: "No response body" };
+      return;
+    }
+    const decoder = new TextDecoder();
+    let buffer = "";
+    try {
+      while (true) {
+        const { done, value } = await reader.read();
+        if (done)
+          break;
+        buffer += decoder.decode(value, { stream: true });
+        const lines = buffer.split("\n");
+        buffer = lines.pop() ?? "";
+        for (const line of lines) {
+          if (!line.startsWith("data: "))
+            continue;
+          const data = line.slice(6).trim();
+          if (data === "[DONE]") {
+            yield { type: "done" };
+            return;
+          }
+          try {
+            const event = JSON.parse(data);
+            if (event.type === "content_block_delta" && event.delta?.type === "text_delta") {
+              yield { type: "text", text: event.delta.text };
+            }
+          } catch {
+          }
+        }
+      }
+    } finally {
+      reader.releaseLock();
+    }
     yield { type: "done" };
   }
   /** Non-streaming convenience wrapper */

src/ClaudeClient.ts

@@ -18,7 +18,7 @@ export interface ClaudeStreamChunk {
   error?: string;
 }
 
-/** Minimal Claude API client using Obsidian's requestUrl (bypasses CORS) */
+/** Minimal Claude API client. streamChat uses fetch+SSE; other methods use requestUrl. */
 export class ClaudeClient {
   private baseUrl = "https://api.anthropic.com/v1/messages";
 
@@ -30,17 +30,14 @@ export class ClaudeClient {
     };
   }
 
-  /**
-   * "Stream" a chat completion via requestUrl (no real streaming — CORS blocks
-   * native fetch from app://obsidian.md). Yields the full response as a single
-   * text chunk so ChatView's streaming loop keeps working unchanged.
-   */
+  /** Stream a chat completion via fetch + SSE, yielding text chunks as they arrive. */
   async *streamChat(
     messages: ClaudeMessage[],
     options: ClaudeOptions
   ): AsyncGenerator<ClaudeStreamChunk> {
-    const response = await requestUrl({
-      url: this.baseUrl,
+    let response: Response;
+    try {
+      response = await fetch(this.baseUrl, {
         method: "POST",
         headers: this.headers(options.apiKey),
         body: JSON.stringify({
@@ -48,17 +45,56 @@ export class ClaudeClient {
           max_tokens: options.maxTokens ?? 8192,
           system: options.systemPrompt,
           messages,
+          stream: true,
         }),
-      throw: false,
       });
-
-    if (response.status >= 400) {
-      yield { type: "error", error: `API Error ${response.status}: ${response.text}` };
+    } catch (e) {
+      yield { type: "error", error: (e as Error).message };
       return;
     }
 
-    const text: string = response.json.content?.[0]?.text ?? "";
-    yield { type: "text", text };
+    if (!response.ok) {
+      const text = await response.text();
+      yield { type: "error", error: `API Error ${response.status}: ${text}` };
+      return;
+    }
+
+    const reader = response.body?.getReader();
+    if (!reader) {
+      yield { type: "error", error: "No response body" };
+      return;
+    }
+
+    const decoder = new TextDecoder();
+    let buffer = "";
+
+    try {
+      while (true) {
+        const { done, value } = await reader.read();
+        if (done) break;
+
+        buffer += decoder.decode(value, { stream: true });
+        const lines = buffer.split("\n");
+        buffer = lines.pop() ?? "";
+
+        for (const line of lines) {
+          if (!line.startsWith("data: ")) continue;
+          const data = line.slice(6).trim();
+          if (data === "[DONE]") { yield { type: "done" }; return; }
+          try {
+            const event = JSON.parse(data);
+            if (event.type === "content_block_delta" && event.delta?.type === "text_delta") {
+              yield { type: "text", text: event.delta.text };
+            }
+          } catch {
+            // skip malformed SSE lines
+          }
+        }
+      }
+    } finally {
+      reader.releaseLock();
+    }
+
     yield { type: "done" };
   }