feat(ui): F8-11 — battles table under table submenu (#54)

Adds a sortable battles list as a new entity under the existing
`view → table` submenu (entity slug `battles`), replacing the
standalone top-level `battle log` shortcut which always opened a
"battle not found" placeholder. The single-battle viewer stays put
and is reached only by clicking a row (or a battle marker on the
map), identical to the existing `section-battles.svelte` flow.

Columns are planet (via the shared `planetLabel` helper) and shots
(the per-battle action count carried by `BattleSummary`), sortable
both ways with shots-desc default. No backend / FBS / map changes:
the wire payload is unchanged. Participants / observers / total
mass require the full BattleReport and were intentionally dropped
to avoid N round trips per menu open.

The top-level `battle log` item is removed from `header/view-menu`
and `sidebar/bottom-tabs` (and their stale comment blocks updated);
the now-orphan `game.view.battle` i18n key is dropped from both
locales.

ui/frontend/src/lib/active-view/table.svelte

@@ -14,6 +14,7 @@ e2e specs (`game-shell.spec.ts`, `view-menu`) keep matching.
 	import TableFleets from "./table-fleets.svelte";
 	import TableSciences from "./table-sciences.svelte";
 	import TableRaces from "./table-races.svelte";
+	import TableBattles from "./table-battles.svelte";
 
 	type Props = { entity: string };
 	let { entity }: Props = $props();
@@ -36,6 +37,8 @@ e2e specs (`game-shell.spec.ts`, `view-menu`) keep matching.
 	<TableSciences />
 {:else if entity === "races"}
 	<TableRaces />
+{:else if entity === "battles"}
+	<TableBattles />
 {:else}
 	<section
 		class="active-view"