refactor(core): remove provider module, migrate to LLMProvider, add client mode handling, improve serialization error handling, update workspace edition, and clean up conditionals and imports

crates/owlen-core/src/conversation.rs

@@ -1,6 +1,6 @@
+use crate::Result;
 use crate::storage::StorageManager;
 use crate::types::{Conversation, Message};
-use crate::Result;
 use serde_json::{Number, Value};
 use std::collections::{HashMap, VecDeque};
 use std::time::{Duration, Instant};
@@ -213,6 +213,34 @@ impl ConversationManager {
         Ok(())
     }
 
+    pub fn cancel_stream(&mut self, message_id: Uuid, notice: impl Into<String>) -> Result<()> {
+        let index = self
+            .message_index
+            .get(&message_id)
+            .copied()
+            .ok_or_else(|| crate::Error::Unknown(format!("Unknown message id: {message_id}")))?;
+
+        if let Some(message) = self.active_mut().messages.get_mut(index) {
+            message.content = notice.into();
+            message.timestamp = std::time::SystemTime::now();
+            message
+                .metadata
+                .insert(STREAMING_FLAG.to_string(), Value::Bool(false));
+            message.metadata.remove(PLACEHOLDER_FLAG);
+            let millis = std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .unwrap_or_default()
+                .as_millis() as u64;
+            message.metadata.insert(
+                LAST_CHUNK_TS.to_string(),
+                Value::Number(Number::from(millis)),
+            );
+        }
+
+        self.streaming.remove(&message_id);
+        Ok(())
+    }
+
     /// Set tool calls on a streaming message
     pub fn set_tool_calls_on_message(
         &mut self,