style(lobby): bold the score line, a touch smaller

Per owner follow-up: the whole lobby score line is now bold (font-weight 700,
matching the over-the-board score plaques) and a hair smaller (0.8rem) to offset
the heavier weight. The viewer's own number keeps its green/red standing tint.

docs/UI_DESIGN.md

@@ -238,10 +238,10 @@ and a long message does not scroll.
 Lobby rows show two lines (opponents, then result + score) with a large place-based emoji
 on the right: Victory 🏆 / Defeat 🥈 / Draw 🏅, and for 3–4-player games II 🥈 / III 🥉 /
 IV 🏅; active games show Your move 🟢 / Opponent's move ⏳; invitations use 💌. The score line
-lists seats in **seat-number order** (matching the over-the-board scoreboard); on an
-**in-progress** game the viewer's **own** number is tinted `--ok` when leading or tied and
-`--danger` when trailing (other numbers stay muted; no bold), a quick "am I ahead" read that
-finished games leave to the place emoji. When a listed
+lists seats in **seat-number order** (matching the over-the-board scoreboard) in a **bold**,
+slightly smaller line; on an **in-progress** game the viewer's **own** number is tinted `--ok`
+when leading or tied and `--danger` when trailing (other numbers stay muted), a quick "am I
+ahead" read that finished games leave to the place emoji. When a listed
 game **becomes your turn or finishes** while the lobby is open, that status emoji **blinks
 twice** (a two-cycle opacity fade, ~2 s; suppressed under reduce-motion) to draw the eye — the
 opponent's-turn change is silent. Each card's blink is keyed by game id, so overlapping