fix(ui): hold each splash word for the pause before the readiness check

The dismiss check fired at the instant a word finished laying, so a word
was never held: ЭРУДИТ fell straight into the lobby (too fast) and
ЗАГРУЗКА got no readable pause. The pause was a *leading* gap before the
next word, not a hold after the current one.

Move the hold to after each word and run the check after it: every word
(ЭРУДИТ included) now stays up for PAUSE_MS before the splash either
dismisses or lays the next word. prefixMs = WORD_MS + PAUSE_MS,
cycleMs = 2*(WORD_MS + PAUSE_MS).

docs/UI_DESIGN.md

@@ -34,10 +34,11 @@ point values** (hardcoded in `lib/splash.ts`, since the alphabet table the board
 
 It is an **App-level overlay** shown while `routeIsLobby && !app.splashDone` (so it also
 covers the session bootstrap; a deep-link to another screen is not covered). The lobby sets
-`app.lobbyReady` when its first load settles (success **or** error), and the splash dismisses
-on the next **word boundary**. ЭРУДИТ lays over ~1 s, then the splash loops
-ЗАГРУЗКА → ОЖИДАНИЕ (clearing back to ЭРУДИТ between rounds) until ready, so even a fast load
-shows it for ~1 s. Each tile **drops in** with a brief scale + fade. Under **reduced motion**
+`app.lobbyReady` when its first load settles (success **or** error). Each word is laid, then
+**held ~0.25 s** so it stays readable, and only after that hold does the readiness check fire —
+so a word never blinks away the instant it finishes. ЭРУДИТ lays + holds over ~1.25 s, then the
+splash loops ЗАГРУЗКА → ОЖИДАНИЕ (clearing back to ЭРУДИТ between rounds) until ready, so even a
+fast load shows it for ~1.25 s. Each tile **drops in** with a brief scale + fade. Under **reduced motion**
 (or the mock build, to keep the Playwright smoke unblocked) it shows a static ЭРУДИТ and
 dismisses as soon as the lobby is ready. The pure layout and timing live in `lib/splash.ts`
 (unit-tested); `Splash.svelte` is the renderer.