ui/phase-14: auto-sync order draft + always GET on boot + header headline

Replaces the manual Submit button with an auto-sync pipeline driven
by `OrderDraftStore`: every successful add / remove / move
coalesces a `submitOrder` call so the engine always mirrors the
local draft. Removing the last command sends an empty cmd[] PUT —
the engine, repo, and rest model now accept that as a valid
"player cleared their draft" state.

`hydrateFromServer` is now invoked unconditionally on game boot so
a fresh device picks up the player's stored order, and the local
cache is overwritten by the server's view (server is the source of
truth).

Header replaces the static "race ?" + turn counter with a single
headline string `<race> @ <game>, turn <n>`, sourced from the
engine's Report.race + the lobby's GameSummary.gameName + the live
turn number, with a `?` fallback while any piece is loading.

Tests:
- engine: empty PUT round-trips, repo round-trips empty Commands
- order-draft: auto-sync sends full draft on every mutation,
  rejected response surfaces error sync status, rapid mutations
  coalesce, server hydration overwrites cache
- order-tab: per-row status flips through the auto-sync lifecycle,
  remove → empty cmd[] PUT, rejected → retry button
- inspector overlay: applied + valid + submitting all participate
  in the optimistic projection
- header: live race / game / turn rendering with fall-back

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

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

@@ -164,12 +164,17 @@ fresh.
 					orderDraft.init({ cache, gameId }),
 				]);
 				galaxyClient.set(client);
-				if (orderDraft.needsServerHydration) {
-					await orderDraft.hydrateFromServer({
-						client,
-						turn: gameState.currentTurn,
-					});
-				}
+				orderDraft.bindClient(client);
+				// The server is always polled at game boot — its
+				// stored order may be fresher than the local cache
+				// (e.g. user is on a new device), and an offline
+				// edit must catch up at re-sync time. The hydration
+				// is non-fatal: a network error keeps the local
+				// cache and surfaces through `draft.syncStatus`.
+				await orderDraft.hydrateFromServer({
+					client,
+					turn: gameState.currentTurn,
+				});
 			} catch (err) {
 				gameState.failBootstrap(describeBootstrapError(err));
 			}