chore : remove debug console.log and alert statements from useTasks hook

[tmdeveloper007]

Closes #1883

Summary of What Has Been Done

Removed all debug console.log statements and the disruptive alert() popup from frontend/src/hooks/useTasks.js.

Changes Made

• Removed console.log in getTasks catch block
• Removed console.log("Task added:", response.data) after task creation
• Removed console.log("FULL ERROR:", error) and related log in addTask catch block
• Replaced alert(error?.response?.data?.message || "Failed to create task") with silent re-throw of the error (the caller already handles errors)
• Removed console.log in updateTask catch block

Impact it Made

• Cleaner browser console for production users
• Removes disruptive alert() popup on task creation failure
• Reduces noise in developer debugging
• Improves user experience during task operations

Note: Please assign this PR to the tmdeveloper007 account.