ui/phase-23: turn-report view with twenty sections and TOC

Replaces the Phase 10 report stub with a scrollable orchestrator that
renders every FBS array as a dedicated section (galaxy summary, votes,
player status, my/foreign sciences, my/foreign ship classes, battles,
bombings, approaching groups, my/foreign/uninhabited/unknown planets,
ships in production, cargo routes, my fleets, my/foreign/unidentified
ship groups). A sticky table of contents (a <select> on mobile),
"back to map" affordance, IntersectionObserver-driven active-section
highlight, and SvelteKit Snapshot-based scroll save/restore round out
the view.

GameReport gains six new fields (players, otherScience, otherShipClass,
battleIds, bombings, shipProductions); decodeReport, the synthetic-
report loader, the e2e fixture builder, and EMPTY_SHIP_GROUPS extend
in lockstep. ~90 new i18n keys land in en + ru together.

The legacy-report parser is extended to populate the new sections from
the dg/gplus text formats (Your Sciences, <Race> Sciences, <Race> Ship
Types, Bombings, Ships In Production). Ships-in-production prod_used
is derived through a new pkg/calc.ShipBuildCost helper; the engine's
controller.ProduceShip refactors to call the same helper without any
behaviour change (engine tests stay unchanged and green). Battles
remain in the parser's Skipped list — the legacy text carries no
stable per-battle UUID.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/frontend/src/routes/games/[id]/report/+page.svelte

@@ -1,5 +1,47 @@
+<!--
+Phase 23 turn-report route. The orchestrator renders the table of
+contents and the twenty sections; scroll save/restore is wired
+through SvelteKit's `Snapshot` API on this route file.
+`window.scrollY` is captured before navigating away and restored
+after `afterNavigate` re-mounts the route. The in-game shell
+layout expands the active-view-host to fit content rather than
+constraining its own height, so the document body is what scrolls
+— hence `window.scroll` rather than a host-element scrollTop.
+
+A short `requestAnimationFrame` poll waits for the body to grow
+tall enough to honour the saved offset, because the captured
+position usually exceeds the viewport height before the sections
+mount on return navigation.
+-->
 <script lang="ts">
+	import type { Snapshot } from "@sveltejs/kit";
+
 	import ReportView from "$lib/active-view/report.svelte";
+
+	function restoreScroll(target: number): void {
+		if (target <= 0) return;
+		let attempts = 60;
+		const tick = (): void => {
+			const need = target + window.innerHeight;
+			const have = document.documentElement.scrollHeight;
+			if (have >= need || attempts === 0) {
+				window.scrollTo(0, target);
+				return;
+			}
+			attempts -= 1;
+			requestAnimationFrame(tick);
+		};
+		requestAnimationFrame(tick);
+	}
+
+	export const snapshot: Snapshot<{ scrollY: number }> = {
+		capture() {
+			return { scrollY: window.scrollY };
+		},
+		restore(value) {
+			restoreScroll(value.scrollY);
+		},
+	};
 </script>
 
 <ReportView />