fix : removed console.log statements from useTasks hook

[tmdeveloper007]

Summary of What Has Been Done

The useTasks.js hook contained debug console.log statements that were leaking internal state to the browser console. These have been removed as the error handling is already done via the onError callback and alert notifications.

Changes Made

1. frontend/src/hooks/useTasks.js:
   • Removed console.log(error?.response?.data?.message || "Failed to load tasks") in getTasks catch block (error is handled elsewhere)
   • Removed console.log("Task added:", response.data) in addTask (the task is already added to state via getTasks)
   • Removed console.log("FULL ERROR:", error) and related console.log calls in addTask catch block (error is already shown via alert)
   • Removed console.log(error?.response?.data?.message || "Failed to update task") in updateTask catch block
   • Cleaned up unused error and response variable declarations to satisfy linting

Impact it Made

• Cleaner browser console output in production environments
• Reduced noise in developer tools
• Error handling already uses alert/toast notifications, making the console.log statements redundant

Closes #2021

Note: Please assign this PR to the tmdeveloper007 account.