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/fpv/FirstPerson.svelte

@@ -290,7 +290,7 @@
       .map((b) => project(b, ex, ey))
       .filter((s): s is Projected => s !== null);
     for (const spot of rubble) {
-      const s = project({ x: spot.x, y: spot.y, src: "/fx3d/rubble.png", scale: 0.4, rise: 0 }, ex, ey);
+      const s = project({ x: spot.x, y: spot.y, src: "/fx3d/rubble.png", scale: 0.55, rise: 0 }, ex, ey);
       if (s) sprites.push({ ...s, fallback: "rubble" });
     }
     for (const f of fx) {