to-do list feature implemented

[prayagupa23]

🚀 Pull Request Checklist
[x] ✅ My issue is assigned to me, and I have not taken up another task simultaneously.
[x] 🔁 I have pulled the latest changes from the main branch.
[x] 🧪 My code is tested and does not break existing functionality.
[ ] 📚 I have added/updated documentation wherever necessary.
[x] 🧹 My code follows the project’s coding standards.
[x] ✍️ My commits are clear and meaningful.
[x] 🧾 I have linked the issue this PR addresses with Closes #55.

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📌 Related Issue

• Closes Implement To-Do List #55

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🧠 Description
This PR implements a personal To‑Do List feature with full frontend and backend integration.

• Frontend (Standalone To‑Do page)

  • Add Task modal with Title, Description, Status, Deadline.
  • Pending and Completed task sections.
  • Filters: All, Upcoming deadlines, Completed.
  • Quick Tips panel, Goals progress, and Weekly Goals widget.
  • Back button to return to the main Dashboard.
  • Dark mode readability improvements (e.g., heading contrast).
  • Full API wiring: fetch, create, edit, complete toggle, delete.

• Backend

  • Task model with fields: title, description, status (pending/completed), deadline, userId (+ timestamps).
  • Secure, user-scoped CRUD:
    • POST /api/tasks — create task (user derived from JWT).
    • GET /api/tasks — list tasks for authenticated user.
    • PUT /api/tasks/:id — update task (owner only).
    • DELETE /api/tasks/:id — delete task (owner only).
    • Ownership enforced; server ignores any client-provided userId.

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✅ Type of Change
[ ] 🐞 Bug fix
[x] 💡 Feature
[ ] 🧹 Code cleanup/refactor
[ ] 🧪 Test cases
[ ] 📚 Docs update

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🧪 How I Tested

• Logged in to obtain localStorage.token.
• Navigated to /todo and verified:
• Create via modal (with/without deadline).
• Edit task via modal; changes persist after refresh.
• Toggle complete; status updates correctly.
• Delete task; item removed and persists after refresh.
• API verified with headers x-auth-token: :
• POST /api/tasks, GET /api/tasks, PUT /api/tasks/:id, DELETE /api/tasks/:id.

Environment:

• Frontend: VITE_API_URL set to backend URL.
• Backend: MONGO_URI, JWT_SECRET, CLIENT_URL, PORT.
  • 🔐 Security/Ownership
  • All endpoints require a valid JWT.
  • userId is attached on the server from the token; client userId is ignored.
  • Update/Delete restricted to the task owner.

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📚 Notes for Reviewers

• UI uses existing design tokens: var(--card), var(--primary), var(--border) for consistent theming (light/dark).
• No breaking changes; new routes mounted at /api/tasks.
  @Annanyatiwary4

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[github-actions]

🙌 Thanks @prayagupa23 for raising this PR!
Our team will review it soon ⏳ — meanwhile, please make sure your PR follows our contributing guidelines 👉 Contributing Guidelines 🎉

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #177 has been merged! 🎉🎉