Share a turn with the world: /watch links, cards and chrome included

The share button lands on the instant replay. One click mints a slug —
persistent, unguessable, one per (room, turn) — and copies a /watch
link anyone can open: the server rebuilds exactly that turn for the
nameless SPECTATOR, public knowledge only, none of the rest of the
game visible. The page arrives with its OpenGraph card pre-baked into
the head (crawlers never run the app): the turn's title and round in
the text, and an og.png of the maze itself — cells, walls, doors, warp
mouths, homes, standees — painted server-side and PNG-encoded with
nothing but node's own zlib. The viewer page wears its chrome: the
WIZ-WAR masthead linking home, the turn's title, the reel opening
straight into the turn-owner's eyes with a "watch it again" loop, and
a footer that says what this table is and deals the visitor in.

The share page loads as its own entry so a shared link never drags the
full app's socket appetite along; the reel's modal scrim learns to
stand in a page instead of over one.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/main.ts

@@ -1,6 +1,10 @@
 import { mount } from "svelte";
-import App from "./App.svelte";
 
-const app = mount(App, { target: document.getElementById("app")! });
-
-export default app;
+// /watch/<id> is the public share page — one turn, anyone may look. It
+// loads its own component so the full app (and its live socket appetite)
+// stays out of a shared link's way.
+const target = document.getElementById("app")!;
+const page = location.pathname.startsWith("/watch/")
+  ? import("./SharePage.svelte")
+  : import("./App.svelte");
+page.then(({ default: Root }) => mount(Root, { target }));