feat: stratagem icons, session summary, queue preview, UX polish

- Download 65 SVG icons from community repo (scripts/download-icons.js)
- Gold CSS filter on all icons to match game theme
- Session summary modal with score/accuracy/top stratagems
- Queue preview strip (next 3 stratagems with icons)
- Score popup animation, icon shake on wrong input
- Icons in history, leaderboard, and best-per-stratagem tables
- server.js: icon fields on all stratagems, ELO in lobby-update WS events

public/icons/eagle_strafing_run.svg

@@ -0,0 +1,14 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 126 126" fill="#fff">
+	<g fill="#de7b6c">
+		<path d="m9 47 29-8 9-29 7 7v38H16Z"/>
+		<path d="M75.8 15.7 78 10l17 10v14.5Zm-9.6 25.5L95 70v13l17 17 1 14-15-2-16-17H71L42.3 66.3 59 60ZM9 79l7.2-2.8L35 95H19Z"/>
+	</g>
+	<path d="m14 69 5-5 15 15-5 5Z"/>
+	<path d="m30 85 5-5 15 15-5 5Z"/>
+	<path d="m33 73 5-5 15 15-5 5Z"/>
+	<path d="m49 89 5-5 15 15-5 5Z"/>
+	<path d="m64 19 5-5 15 15-5 5Z"/>
+	<path d="m80 35 5-5 15 15-5 5Z"/>
+	<path d="m68 38 5-5 15 15-5 5Z"/>
+	<path d="m84 54 5-5 15 15-5 5Z"/>
+</svg>