chore : replaced emoji with Flame icon in ReflectionSummary weekly momentum

[tmdeveloper007]

Summary of What Has Been Done

Replaced the hardcoded fire emoji (🔥) in the Weekly Momentum card of ReflectionSummary.jsx with a Lucide Flame icon component.

Changes Made

1. Added import { Flame } from "lucide-react" at the top of the file.
2. Replaced the inline weeklyText variable that contained the emoji with a conditional render inside the JSX.
3. The Flame icon uses text-orange-500 fill-orange-500 for proper visibility in both light and dark modes.

Impact it Made

• Removed emoji character for consistent UI design language across the application.
• Lucide icon scales cleanly and matches the vector-icon-based design used throughout the dashboard.
• The icon renders with proper fill color, providing a visually distinct indicator of strong weekly performance.

Note: please assign this PR to the tmdeveloper007 account.