fix: add trim option to mongoose string fields to trim whitespace

[n1o5]

📌 Description

The trim: true option was added to the string fields of Task, User, and Routine models. This allows users to save data while enabling automatic trimming of whitespace.

🔗 Related Issue

Closes #53

🛠 Changes Made

Added trim: true to the following:

1. Title, description and tags in Task
2. Name and email in User
3. Name and day in Routine

✅ Checklist

• Code runs locally
• Followed project structure
• No console errors
• Properly tested changes
• Linked the issue

[aryandas2911]

@n1o5 pls fix the linting error for backend and frontend

[n1o5]

it was an env mismatch wrt node version; have updated it now
edit: @aryandas2911 can you look into this now?

[aryandas2911]

@n1o5 remove the node 20 version from yml dont touch it and lint