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/screens/Login.svelte

@@ -17,10 +17,17 @@
   }
 
   async function signIn() {
+    if (busy || code.trim().length === 0) return;
     busy = true;
     await loginEmail(email.trim(), code.trim());
     busy = false;
   }
+
+  // Track the code and auto-submit once the 6-digit code is complete (Enter submits too).
+  function onCode(v: string): void {
+    code = v;
+    if (code.trim().length === 6) void signIn();
+  }
 </script>
 
 <main class="login">
@@ -46,10 +53,16 @@
     {:else}
       <p class="muted">{t('login.codeSent', { email })}</p>
       <input
+        class="codein"
         inputmode="numeric"
         autocomplete="one-time-code"
+        maxlength="6"
         placeholder={t('login.codePlaceholder')}
-        bind:value={code}
+        value={code}
+        oninput={(e) => onCode(e.currentTarget.value)}
+        onkeydown={(e) => {
+          if (e.key === 'Enter') void signIn();
+        }}
       />
       <button class="secondary" disabled={busy || !code.trim()} onclick={signIn}>
         {t('login.signIn')}
@@ -98,6 +111,11 @@
     color: var(--text);
     font-size: 1rem;
   }
+  /* The email code: the same spread-digit look as the friend-code input elsewhere. */
+  .codein {
+    letter-spacing: 0.3em;
+    font-size: 1.1rem;
+  }
   button {
     padding: 12px;
     border-radius: var(--radius-sm);