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_illumination_flare.svg

@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 126 126" fill="#fff">
+<path fill="#c9b269" d="M4 122v-20l20 20H4Zm118 0v-20l-20 20h20Zm0-118v20L102 4h20ZM4 4v20L24 4H4Z"/>
+<circle cx="63" cy="63" r="12"/>
+<path d="m43.8 84.7-.7-.7-1.4-1.4-.7-.7 9.2-9.2.7.7 1.4 1.4.7.7Z"/>
+<path d="m85 82.2-.7.7-1.4 1.4-.7.7-9.2-9.2.7-.7 1.4-1.4.7-.7Z"/>
+<path d="m43.8 41.3-.7.7-1.4 1.4-.7.7 9.2 9.2.7-.7 1.4-1.4.7-.7Z"/>
+<path d="m85 43.8-.7-.7-1.4-1.4-.7-.7-9.2 9.2.7.7 1.4 1.4.7.7Z"/>
+<path d="M15 65v-4h32v4H15Z"/>
+<path d="M79 61h32v3H79z"/>
+<path d="M79 62h32v3H79z"/>
+<path d="M61 79h3v21h-3z"/>
+<path d="M62 79h3v21h-3z"/>
+<path d="M61 26h3v21h-3z"/>
+<path d="M62 26h3v21h-3z"/>
+</svg>