fix: persist stats across session changes, only reset on disconnect

- Reuse existing WslBridge when reconnecting (preserves stats)
- Move reset_session() from start() to stop() so stats only clear on explicit disconnect
- Stats now persist through permission prompts, interrupts, and question prompts

Closes #59

src-tauri/src/bridge_manager.rs

@@ -29,7 +29,7 @@ impl BridgeManager {
         conversation_id: &str,
         options: ClaudeStartOptions,
     ) -> Result<(), String> {
-        // Check if a bridge already exists for this conversation
+        // Check if a bridge already exists and is running for this conversation
         if self.bridges.get(conversation_id).map(|b| b.is_running()).unwrap_or(false) {
             return Err("Claude is already running for this conversation".to_string());
         }
@@ -38,15 +38,15 @@ impl BridgeManager {
             .ok_or_else(|| "App handle not set".to_string())?
             .clone();
 
-        // Create a new bridge for this conversation
-        let mut bridge = WslBridge::new_with_conversation_id(conversation_id.to_string());
+        // Reuse existing bridge if it exists (preserves stats across reconnects)
+        // Only create a new bridge if one doesn't exist for this conversation
+        let bridge = self.bridges
+            .entry(conversation_id.to_string())
+            .or_insert_with(|| WslBridge::new_with_conversation_id(conversation_id.to_string()));
 
         // Start the Claude process
         bridge.start(app, options)?;
 
-        // Store the bridge
-        self.bridges.insert(conversation_id.to_string(), bridge);
-
         Ok(())
     }
 

src-tauri/src/wsl_bridge.rs

@@ -292,8 +292,8 @@ impl WslBridge {
         self.stdin = stdin;
         self.process = Some(child);
 
-        // Reset session stats when starting new session
-        self.stats.write().reset_session();
+        // Note: We no longer reset stats here - stats persist across reconnects
+        // Stats are only reset when explicitly disconnecting via stop()
 
         // Load saved achievements
         let app_handle = app.clone();
@@ -411,6 +411,10 @@ impl WslBridge {
         self.stdin = None;
         self.session_id = None;
         self.mcp_config_file = None; // Temp file is automatically deleted when dropped
+
+        // Reset session stats on explicit disconnect
+        self.stats.write().reset_session();
+
         emit_connection_status(app, ConnectionStatus::Disconnected, self.conversation_id.clone());
     }