ui/phase-11: map wired to live game state

Replaces the Phase 10 map stub with live planet rendering driven by
`user.games.report`, and wires the header turn counter to the same
data. Phase 11's frontend sits on a per-game `GameStateStore` that
lives in `lib/game-state.svelte.ts`: the in-game shell layout
instantiates one per game, exposes it through Svelte context, and
disposes it on remount. The store discovers the game's current turn
through `lobby.my.games.list`, fetches the matching report, and
exposes a TS-friendly snapshot to the header turn counter, the map
view, and the inspector / order / calculator tabs that later phases
will plug onto the same instance.

The pipeline forced one cross-stage decision: the user surface needs
the current turn number to know which report to fetch, but
`GameSummary` did not expose it. Phase 11 extends the lobby
catalogue (FB schema, transcoder, Go model, backend
gameSummaryWire, gateway decoders, openapi, TS bindings,
api/lobby.ts) with `current_turn:int32`. The data was already
tracked in backend's `RuntimeSnapshot.CurrentTurn`; surfacing it is
a wire change only. Two alternatives were rejected: a brand-new
`user.games.state` message (full wire-flow for one field) and
hard-coding `turn=0` (works for the dev sandbox, which never
advances past zero, but renders the initial state for any real
game). The change crosses Phase 8's already-shipped catalogue per
the project's "decisions baked back into the live plan" rule —
existing tests and fixtures are updated in the same patch.

The state binding lives in `map/state-binding.ts::reportToWorld`:
one Point primitive per planet across all four kinds (local /
other / uninhabited / unidentified) with distinct fill colours,
fill alphas, and point radii so the user can tell them apart at a
glance. The planet engine number is reused as the primitive id so
a hit-test result resolves directly to a planet without an extra
lookup table. Zero-planet reports yield a well-formed empty world;
malformed dimensions fall back to 1×1 so a bad report cannot crash
the renderer.

The map view's mount effect creates the renderer once and skips
re-mount on no-op refreshes (same turn, same wrap mode); a turn
change or wrap-mode flip disposes and recreates it. The renderer's
external API does not yet expose `setWorld`; Phase 24 / 34 will
extract it once high-frequency updates land. The store installs a
`visibilitychange` listener that calls `refresh()` when the tab
regains focus.

Wrap-mode preference uses `Cache` namespace `game-prefs`, key
`<gameId>/wrap-mode`, default `torus`. Phase 11 reads through
`store.wrapMode`; Phase 29 wires the toggle UI on top of
`setWrapMode`.

Tests: Vitest unit coverage for `reportToWorld` (every kind,
ids, styling, empty / zero-dimension edges, priority order) and
for the store lifecycle (init success, missing-membership error,
forbidden-result error, `setTurn`, wrap-mode persistence across
instances, `failBootstrap`). Playwright e2e mocks the gateway for
`lobby.my.games.list` and `user.games.report` and asserts the
live data path: turn counter shows the reported turn,
`active-view-map` flips to `data-status="ready"`, and
`data-planet-count` matches the fixture count. The zero-planet
regression and the missing-membership error path are covered.

Phase 11 status stays `pending` in `ui/PLAN.md` until the local-ci
run lands green; flipping to `done` follows in the next commit per
the per-stage CI gate in `CLAUDE.md`.

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

ui/frontend/src/lib/header/turn-counter.svelte

@@ -1,15 +1,31 @@
 <!--
-Phase 10 placeholder turn counter. The displayed value is the static
-`?` glyph from `game.shell.turn_unknown`; Phase 11 swaps the source
-to the live game state. The wrapping span is kept as the public
-shape so Phase 11 only needs to replace the inner text.
+Phase 11 turn counter: reads the live turn number from the per-game
+`GameStateStore` provided through context by
+`routes/games/[id]/+layout.svelte`. Renders the static `?` placeholder
+from `game.shell.turn_unknown` when the store has not yet produced a
+report (boot, network error, no membership) so the header chrome
+keeps its width across loading transitions.
+
+Phase 26 will turn this into a clickable trigger that opens the
+turn navigator; Phase 24 wires push-event-driven turn-ready toasts
+that may flash this counter when a new turn is ready.
 -->
 <script lang="ts">
+	import { getContext } from "svelte";
 	import { i18n } from "$lib/i18n/index.svelte";
+	import { GAME_STATE_CONTEXT_KEY, type GameStateStore } from "$lib/game-state.svelte";
+
+	const store = getContext<GameStateStore | undefined>(GAME_STATE_CONTEXT_KEY);
+
+	const display = $derived.by(() => {
+		const report = store?.report ?? null;
+		if (report === null) return i18n.t("game.shell.turn_unknown");
+		return String(report.turn);
+	});
 </script>
 
-<span class="turn" data-testid="turn-counter">
-	{i18n.t("game.shell.turn_label")}&nbsp;{i18n.t("game.shell.turn_unknown")}
+<span class="turn" data-testid="turn-counter" data-turn={display}>
+	{i18n.t("game.shell.turn_label")}&nbsp;{display}
 </span>
 
 <style>