fix(ui): local-game history (hide social, keep dictionary); Enter dismisses keyboard; email-code autosubmit

- History drawer in a local (offline) game: the seat plaques no longer
  show the add-friend/block controls — canAddFriend/canBlock now exclude a
  local game (hotseat seats have synthetic account ids that slipped past
  the vs_ai-only guard) — and the Dictionary entry is restored: an active
  hotseat game keeps the comms button, and CommsHub is Dictionary-only for
  a chatless vs_ai OR hotseat game (ChatScreen never mounts offline).
- Enter on any single-line <input> now dismisses the soft keyboard (blur);
  a <textarea> (feedback) keeps Enter for newlines. One global handler.
- Login email code: the friend-code spread-digit style (.codein), a
  6-char cap, auto-submit on the 6th digit, and Enter to submit.
- e2e: the local-game history has no social controls and keeps the
  dictionary entry.

ui/src/game/Game.svelte

@@ -1422,8 +1422,9 @@
   // (not the still-empty seat of an open game) who is not yet a friend (an already-requested
   // opponent still shows it, but disabled).
   function canAddFriend(s: { accountId: string; seat: number }): boolean {
-    // Never offer add-friend against an AI opponent, an existing friend, or a blocked player.
-    if (view?.game.vsAi) return false;
+    // Never offer add-friend against an AI opponent, an existing friend, or a blocked player — nor in
+    // a local (offline) game, whose seats are account-less: vs_ai, and hotseat's synthetic seat ids.
+    if (view?.game.vsAi || isLocalGameId(id)) return false;
     return (
       !!s.accountId &&
       !app.profile?.isGuest &&
@@ -1437,7 +1438,7 @@
   // may still be blocked (the block overrides the friendship), so it omits the friend exclusion.
   // An already-blocked opponent hides it (both controls go, and the name is struck).
   function canBlock(s: { accountId: string; seat: number }): boolean {
-    if (view?.game.vsAi) return false;
+    if (view?.game.vsAi || isLocalGameId(id)) return false;
     return !!s.accountId && !app.profile?.isGuest && s.accountId !== app.session?.userId && !seatBlocked(s);
   }
 </script>
@@ -1546,10 +1547,11 @@
         <button class="hicon" onclick={onResignClick} disabled={waitingForOpponent} aria-label={t('game.dropGame')}>🏁</button>
       {/if}
       {#if !view.game.multipleWordsPerTurn}<span class="oneword-label">{t('game.oneWordRule')}</span>{/if}
-      <!-- A finished AI game has no comms at all (no chat, and the dictionary closes with the
-           game), so the entry is dropped; an active AI game keeps it (it opens the dictionary).
-           A hotseat game has no chat either (local players, no accounts). -->
-      {#if !(gameOver && view.game.vsAi) && !view.game.hotseat}
+      <!-- The comms entry opens Chat + the word Dictionary. A local game (vs_ai or hotseat) has no
+           chat, so its hub is Dictionary-only (CommsHub), and once finished the dictionary closes too
+           — so drop the entry only when a local game is finished; an active local game keeps it for
+           the Dictionary. An online game always keeps it (chat outlives the game). -->
+      {#if !(gameOver && (view.game.vsAi || view.game.hotseat))}
         <button class="hicon" onclick={() => navigate(`/game/${id}/chat`)} aria-label={t('game.chat')}>
           {#key chatBlink}<span class="chat-ico" class:blink={chatBlink > 0 && !app.reduceMotion}>💬</span>{/key}
         </button>