Fix emoji award 404 by storing emoji in Awards.icon field

[Copilot]

After completing a module, the award popup displays /belt/CURRENT.svg which 404s. The new emoji award style uses name="CURRENT" as an identifier, but the popup logic treats multi-character names as belt awards and attempts to load them as images.

Changes

• Store emoji character in Awards.icon field when creating emoji awards, keeping name="CURRENT" for tracking purposes
• Update popup logic to check for award.icon to distinguish emoji awards from belts, displaying the emoji character instead of attempting image load
• Extract dojo name from description using regex to show meaningful message (e.g., "You have officially been awarded the Intro to Cybersecurity badge!")
• Update feed to use icon field for user emoji display to avoid rendering "CURRENT" as text
• Add constants EMOJI_CURRENT and EMOJI_STALE for maintainability

Key changes

# awards.py - Store emoji in icon field
db.session.add(Emojis(user=user, name=EMOJI_CURRENT, description=description, 
                     category=hex_dojo_id, icon=emoji))

// popup.js - Check for icon to distinguish emoji from belt
const isBelt = Array.from(award.name).length > 1 && !award.icon;
const image = isBelt
    ? `<img src="/belt/${award.name}.svg" class="belt-image">`
    : `<div class="emoji-display">${award.icon || award.name}</div>`;

Backward compatible with existing belt awards and legacy emoji awards (single character names without icons).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Award emoji 404</issue_title>
<issue_description>After completing a module, the award emoji link is https://pwn.college/belt/CURRENT.svg

dojo/dojo_plugin/utils/awards.py

Line 153 in c0ab4a8

db.session.add(Emojis(user=user, name="CURRENT", description=description, category=hex_dojo_id))

I think reverting it back to use emoji var would fix the issue but I dont know how to test it.</issue_description>

<agent_instructions>modify the alert logic to display the dojo name for the emoji instead of the "CURRENT" identifier</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@zardus The new style is to use `CURRENT` as the name and look up the emoji itself from the dojo. The alert logic itself needs to be updated, though...

• Fixes Award emoji 404 #908

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