Add context menu to calendar view for task management

Integrates context menu functionality into the CalendarView component, allowing task management via right-click (desktop) or long-press (mobile), mirroring the existing task list menu options. Includes handlers for task update, edit, delete, and timer start/stop.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ceced2fc-aa46-458d-ba87-ddd4b7bb1518
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/659922a9-0087-461c-90dd-6d9a58b81d4d/ceced2fc-aa46-458d-ba87-ddd4b7bb1518/7gWYrTe

client/src/App.tsx

@@ -304,6 +304,11 @@ function App() {
             onTaskDrop={handleTaskDrop}
             onTaskClick={handleTaskClick}
             onDateSelect={(date) => console.log('Date selected:', date.toLocaleDateString())}
+            onTaskUpdate={handleTaskUpdate}
+            onTaskEdit={handleTaskClick}
+            onTaskDelete={handleTaskDelete}
+            onStartTimer={startTimer}
+            onStopTimer={stopTimer}
           />
         );