fix: remove artificial MAX_STREAM_CHUNKS limit that cut off long responses

The plugin hard-capped streaming responses at 1000 chunks. For large
models like qwen2.5:32b generating detailed answers, this limit was
easily exceeded, causing the response to stop mid-sentence.

The Ollama stream already terminates naturally when the model sends the
final done signal, so the artificial chunk limit served no purpose.

- src/chat-view.ts: Remove chunkCount tracking and MAX_STREAM_CHUNKS
  constant. Let the stream run until Ollama signals completion.

src/chat-view.ts

@@ -487,7 +487,6 @@ export class ChatView extends ItemView {
 
       let fullResponse = '';
       let toolCalls: OllamaToolCall[] = [];
-      let chunkCount = 0;
 
       for await (const chunk of stream) {
         if (chunk.content) {
@@ -502,11 +501,6 @@ export class ChatView extends ItemView {
         if (chunk.tool_calls) {
           toolCalls = [...toolCalls, ...chunk.tool_calls];
         }
-
-        chunkCount++;
-        if (chunkCount > MAX_STREAM_CHUNKS) {
-          break;
-        }
       }
 
       // Process tool calls if any
@@ -575,5 +569,4 @@ export class ChatView extends ItemView {
   private conversationStateManager: ConversationStateManager;
 }
 
-const MAX_STREAM_CHUNKS = 1000;
 const MAX_TOOL_CALLS = 5;