feat: display priority badges on task cards.

[Sweety3106]

Summary

Displays the task priority level (High, Medium, Low) as a color-coded badge pill on every task card in the dashboard.

Changes Made

• Added priority detection logic in renderTasks() in js/app.js
• Maps high → 🔴 red pill, medium → 🟡 amber pill, low → 🔵 blue pill
• Uses existing .pill-red, .pill-amber, .pill-blue CSS classes (no CSS changes needed)

Testing

• Verified tasks render with the correct priority badge based on their stored priority value

Checklist

• Code follows project style
• Tested locally
• No unrelated changes included
• Documentation updated (if applicable)