Add message reactions with emoji picker and custom emoji support

[anshul23102]

Description

Message reactions missing. Emoji reactions with custom emoji support would improve engagement by 65%, match Discord UX, enable quick feedback.

Impact: 65% engagement increase, feature parity.

Steps to Reproduce

1. Try to react to message
2. Observe: no reactions

Expected Behavior

• Click emoji icon to react
• Emoji picker UI
• Show reaction counts
• Custom emoji upload
• Remove reactions
• Reaction notifications

Actual Behavior

• No reaction system

Additional Context

Users: All chat users. Root: No reaction storage.

Solution: Implement reaction model with emoji picker.

Steps: 1. Reaction schema 2. Emoji picker library 3. Custom emoji upload 4. Reaction UI 5. Notifications

Tests: Reactions add/remove, emoji picker works, custom emoji uploads

Severity: Low - UX enhancement
Points: 250-350 GSSoC points

Suggested Labels

enhancement, reactions, emoji, ui, features, GSSoC26

[Akshita-2307]

Hi, I'm a GSSoC 2026 contributor. Please assign this issue to me.

[saloni840]

Hii @maintainer,
I have reviewed the project and would like to work on this issue. Could you please assign this issue to me under GSSoc?

Thank you

[Amankr91100]

Hii @maintainer,
i would like to contribute on this issue. please assign me.