Add WelcomeStats component and integrate session management in FlagQuiz

- Created a new WelcomeStats component to display user statistics and session results.
- Integrated session management in FlagQuiz, allowing users to track their performance across multiple sessions.
- Updated game state handling to include session completion and results display.
- Enhanced user experience with improved navigation and session reset functionality.

public/icons/chart-square.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 18V9" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
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+</svg>

public/icons/chart.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M3 22H21" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
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+</svg>

public/icons/medal-star.svg

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
 <svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
 <path d="M17 8V6C17 4.11438 17 3.17157 16.4142 2.58579C15.8284 2 14.8856 2 13 2H11C9.11438 2 8.17157 2 7.58579 2.58579C7 3.17157 7 4.11438 7 6V8" stroke="currentColor" stroke-width="1.5"/>
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