Add daily note widge with autosave, loading state, and yesterday note toggle.

[nikita-9112]

Summary

This PR added a daily note widget to the dashboard so users can quickly plan what they want to code today.

Closes #1070

Type of Change

• Added the Daily Note widge UI to the dashboard.
• Added GET/POST API handling for daily notes.
• Stored notes in the database by (user_id, date).
• Implemented autosave with debounce.
• Added character limit support
• Added loading state while fetching note data.
• Added support for showing yesterday's note on click.

Why is change

This feature helps users build a simple daily planing habit directly inside the dashboard without switching to another notes app.

How to Test

Steps for the reviewer to verify this works:

1. Verified today's note is fetched and desplayed correctly.
2. verified note autosave after 500ms or blur
3. Verified note persists after page refresh
4. Verified same-day note updates instead of creating duplicate rows.
5. Verified yesterday's note is fetched.

Screenshots (if UI change)

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[Priyanshu-byte-coder]

This PR has merge conflicts with current main in src/app/dashboard/page.tsx and src/app/page.tsx. Please rebase onto current main and resolve the conflicts.

[Priyanshu-byte-coder]

Your PR has conflicts with the current main branch. Please rebase on main to resolve conflicts and this can be reviewed for merging. Labels have been added ✅

[nikita-9112]

Your PR has conflicts with the current main branch. Please rebase on main to resolve conflicts and this can be reviewed for merging. Labels have been added ✅

I have resolve the conflicts issue. Please review for merging.