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/orbital_airburst_strike.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 126 126" fill="#fff">
+<path fill="#de7b6c" d="M99 120a91 91 0 0 0-4.5-27h15.3a53.7 53.7 0 0 1 7.2 27H99ZM86.1 77.4l-3-7.5A54 54 0 0 1 107.9 90H93.4a50.6 50.6 0 0 0-7.2-12.6ZM90.3 90H69V68.3l1 .3L76 84l8.7-3.7a47 47 0 0 1 5.5 9.7Zm-48.1-9.7 8.7 3.7L57 68.6l.9-.3V90H36.7a47 47 0 0 1 5.5-9.7ZM33.6 90H18.1a54 54 0 0 1 26-20.5l-3.3 7.9A50.5 50.5 0 0 0 33.6 90Zm-5.5 30H9a53.7 53.7 0 0 1 7.2-27h16.3c-2.4 7.1-4.1 16-4.4 27ZM63 174a53.7 53.7 0 0 1-32.6-11h65.2A53.7 53.7 0 0 1 63 174Zm28.5-81a85.5 85.5 0 0 1 4.6 27H65V93h26.5Zm-56 0H62v27H31a85.5 85.5 0 0 1 4.5-27Z"/>
+<path d="M62 49h3v4h-3z"/>
+<path d="M62 58h3v4h-3z"/>
+<path d="M62 67h3v4h-3z"/>
+<path d="M62 76h3v4h-3z"/>
+<path d="M62 85h3v4h-3z"/>
+<path d="m56 47.8 2.8 1-1.2 3.8-2.9-1Z"/>
+<path d="m53.2 56.4 2.8 1-1.2 3.7-2.8-.9Z"/>
+<path d="m50.4 65 2.9.9-1.2 3.8-2.9-1Z"/>
+<path d="m47.4 73 2.9.9-1.2 3.8-2.9-1Z"/>
+<path d="m68.4 48.5 2.9-1 1.3 3.9-2.9 1Z"/>
+<path d="m71.4 57 2.8-1 1.3 3.9-2.8 1Z"/>
+<path d="m74.3 65.6 2.8-1 1.3 3.8-2.8 1Z"/>
+<path d="m76.7 73.8 2.8-1 1.3 3.8-2.8 1Z"/>
+<path d="M70.8 32.6 76 37l-6.3-.3L71 43l-5-4-2.5 6-2.5-6-5 4 1.3-6.3-6.3.3 5.2-4.4L51 29h6l-1-6 6 4V12h3v15l6-4-1 6h6Z"/>
+</svg>