Method setActiveSession

main/src/services/gitStatusManager.ts:80–104

* Set the currently active session for smart polling

(sessionId: string | null)

   * Set the currently active session for smart polling
   */
  setActiveSession(sessionId: string | null): void {
    const previousActive = this.activeSessionId;
    this.activeSessionId = sessionId;
    
    if (previousActive !== sessionId) {
      console.log(`[GitStatus] Active session changed from ${previousActive} to ${sessionId}`);
      
      // Start watching the active session's files if we have one
      if (sessionId) {
        this.startWatchingSession(sessionId);
        
        // If window is visible, also refresh immediately
        if (this.isWindowVisible) {
          this.refreshSessionGitStatus(sessionId, false).catch(error => {
            console.warn(`[GitStatus] Failed to refresh active session ${sessionId}:`, error);
          });
        }
      }
      
      // Stop watching the previous active session if it exists
      if (previousActive) {
        this.stopWatchingSession(previousActive);
      }
    }
  }
  
  /**
   * Start file watching for a session