feat(ui): F8-10 — tables planets / ship-groups / fleets, ship-classes delete guard (#53)

Lights up three previously-stubbed table active views and tightens the
existing one:

  - table-planets: 4 kind checkboxes (own / foreign / uninhabited /
    unknown) + race dropdown that filters the foreign slice; row click
    selects + centres the planet on the map.
  - table-ship-groups: local + foreign groups in one grid, owner
    checkboxes, planet dropdown (destination OR origin), class
    dropdown; on-planet click focuses the destination planet, in-space
    click focuses the ship group itself (camera follows interpolated
    position).
  - table-fleets: own fleets only with the shared planet dropdown;
    on-planet click focuses the planet, in-space click centres the
    camera on the interpolated fleet position without altering the
    selection (no fleet variant in Selected).
  - table-ship-classes: per-row Delete is disabled with a count tooltip
    while at least one local ship group references the class. The
    engine refuses the removal anyway; the UI pre-empts the surface.

Wires the click → map flow through a transient `SelectionStore.focus`
/ `focusPoint` channel that `map.svelte` consumes once on mount —
in-memory only, so an F5 does not re-centre.

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

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

@@ -1,16 +1,17 @@
 <!--
-Active-view router for the per-entity tables. Phase 17 lights up
-the ship-classes table; Phase 21 lights up the sciences table;
-Phase 22 lights up the races table; the remaining slugs (planets,
-ship-groups, fleets) keep the Phase 10 stub copy until their
-respective phases land. The wrapper preserves
+Active-view router for the per-entity tables. Phase 17 lit up
+ship-classes; Phase 21 sciences; Phase 22 races; F8-10 lights up
+planets, ship-groups, and fleets. The wrapper preserves
 `data-testid="active-view-table"` and `data-entity={entity}` for
 every branch (each leaf component mirrors them) so the navigation
 e2e specs (`game-shell.spec.ts`, `view-menu`) keep matching.
 -->
 <script lang="ts">
 	import { i18n, type TranslationKey } from "$lib/i18n/index.svelte";
+	import TablePlanets from "./table-planets.svelte";
 	import TableShipClasses from "./table-ship-classes.svelte";
+	import TableShipGroups from "./table-ship-groups.svelte";
+	import TableFleets from "./table-fleets.svelte";
 	import TableSciences from "./table-sciences.svelte";
 	import TableRaces from "./table-races.svelte";
 
@@ -23,8 +24,14 @@ e2e specs (`game-shell.spec.ts`, `view-menu`) keep matching.
 	}
 </script>
 
-{#if entity === "ship-classes"}
+{#if entity === "planets"}
+	<TablePlanets />
+{:else if entity === "ship-classes"}
 	<TableShipClasses />
+{:else if entity === "ship-groups"}
+	<TableShipGroups />
+{:else if entity === "fleets"}
+	<TableFleets />
 {:else if entity === "sciences"}
 	<TableSciences />
 {:else if entity === "races"}