feat(ui): F8-05 — game-mode chrome cleanup + inspector compact rows (#48)

Drains six F8 polish items (parent #43) in one feature:

а) Chrome cleanup
- п.6 — remove the AccountMenu (settings/sessions/theme/language/logout
  ∼ rudimentary in-game) and replace it with a single icon-button
  light/dark theme toggle. The toggle flips an in-memory `theme.override`;
  game-shell unmount calls `theme.clearOverride()` so the lobby (and
  any re-entry) re-projects the persisted lobby choice.
- п.8 — remove the wrap-scrolling radio from the map gear popover. The
  per-game `wrapMode` store and the renderer's no-wrap path stay in
  place for a future engine-side topology feature; only the UI surface
  is dropped (wrap is a server-side concept, not a per-session UI
  affordance).

б) Inspector compact rows (single idiom: select + ✓ apply / ✗ cancel,
or contextual edit/remove/add)
- п.13 — planet name is now click-to-edit: clicking the name opens an
  inline `<input>` + ✓ confirm icon; Escape cancels; the explicit
  Rename action button and Cancel button are gone.
- п.14 — production becomes one row: primary `<select>` picks
  industry/materials/research/ship, conditional secondary `<select>`
  picks the target (tech / science / ship class) for research and
  ship contexts. Apply is gated until row state differs from the
  planet's current effective production; auto-submit-on-click is
  replaced by the apply-gate.
- п.16 — cargo routes collapse to one row: a single dropdown
  (COL/CAP/MAT/EMP plus a placeholder that absorbs the old section
  title) and contextual action buttons (add / edit + remove) to the
  right. After a successful pick or remove the dropdown stays on the
  type the user just acted on.
- п.32 — stationed ship groups hoist the race column into a dropdown
  above the table. The dropdown seeds with the player's own race when
  local groups are stationed here, otherwise the first race
  alphabetically; rendered only when more than one race is in orbit.
  The race column is dropped in both single- and multi-race modes —
  the dropdown's value already names the active race.

Tests: unit and Playwright e2e updated for every changed test-id and
flow; new coverage added for `theme.override`, the in-game toggle, the
apply-gate behaviour, and the stationed-race dropdown. i18n keys for
the removed menu items, the wrap radios, the cargo title, and the
explicit `rename.cancel` are dropped from both locales; new
`game.shell.theme_toggle.*`, `production.main/target.*`,
`production.apply/cancel`, `cargo.placeholder`, and
`ship_groups.race_filter.aria` keys land.

Docs synced: `docs/FUNCTIONAL.md` §6.7 + `docs/FUNCTIONAL_ru.md`
mirror drop the torus / no-wrap radio mention; `ui/docs/design-system.md`
documents the lobby-owned persisted picker + the in-game ephemeral
override channel.

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

ui/frontend/src/lib/header/game-mode-theme-toggle.svelte

@@ -0,0 +1,60 @@
+<!--
+In-game ephemeral light/dark theme toggle. Replaces the previous account
+menu in the top-right of the game shell. The persisted theme choice
+(system/light/dark) lives in the lobby's profile screen; this toggle
+only flips an in-memory `override` on the shared `theme` store, so the
+game shell can be re-themed without touching the user's persisted
+preference. The override is cleared on shell unmount (see
+`game-shell.svelte`), so leaving and re-entering the game re-projects
+the persisted choice.
+-->
+<script lang="ts">
+	import { i18n } from "$lib/i18n/index.svelte";
+	import { theme } from "$lib/theme/theme.svelte";
+
+	const next = $derived(theme.resolved === "light" ? "dark" : "light");
+	const label = $derived(
+		i18n.t(
+			next === "light"
+				? "game.shell.theme_toggle.to_light"
+				: "game.shell.theme_toggle.to_dark",
+		),
+	);
+
+	function toggle(): void {
+		theme.setOverride(next);
+	}
+</script>
+
+<button
+	type="button"
+	class="theme-toggle"
+	data-testid="game-mode-theme-toggle"
+	data-theme={theme.resolved}
+	aria-label={label}
+	aria-pressed={theme.resolved === "dark"}
+	onclick={toggle}
+>
+	<span aria-hidden="true">{theme.resolved === "light" ? "☼" : "☾"}</span>
+</button>
+
+<style>
+	.theme-toggle {
+		min-width: 44px;
+		min-height: 44px;
+		display: inline-flex;
+		align-items: center;
+		justify-content: center;
+		font: inherit;
+		font-size: 1.1rem;
+		padding: 0.25rem 0.6rem;
+		background: transparent;
+		color: inherit;
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-sm);
+		cursor: pointer;
+	}
+	.theme-toggle:hover {
+		background: var(--color-surface-hover);
+	}
+</style>