Refined User Interface Terminology

What: Updated terminology from "bash shells" to "tasks" throughout the interface Details:

• Changed "List and manage background bash shells" to "List and manage background tasks"
• Updated "No background shells currently running" to "No tasks currently running"
• More inclusive language supporting different types of background operations
• Consistent terminology across all user-facing messages
• Evidence: line 411750 vs line 408227 in v1.0.100, line 411633 vs line 408178 in v1.0.100