feat: add context view tests and enhance context drop zone

- Introduced a new test suite for the Context View, covering file management, editing, and edge cases.
- Added a data-testid attribute to the context drop zone for improved testability.
- Implemented various tests for creating, editing, deleting, and uploading context files, ensuring robust functionality and user experience.

apps/app/src/components/views/context-view.tsx

@@ -393,6 +393,7 @@ export function ContextView() {
         className="flex-1 flex overflow-hidden"
         onDrop={handleDrop}
         onDragOver={handleDragOver}
+        data-testid="context-drop-zone"
       >
         {/* Left Panel - File List */}
         <div className="w-64 border-r border-border flex flex-col overflow-hidden">