Add player portal + character-sheet front end (phase 4 follow-up)

Turns the raw shard endpoints into proper, navigable pages in the site's visual
language.

- components/CharacterSheet.jsx: reusable sheet — attribute tiles, vitals bars,
  resistances, skills (with bars), and equipment — styled with the shared
  panel/grid vocabulary.
- Player portal with a nav bar: PlayerPortalLayout (Characters / Account tabs +
  sign-out) wraps /player and /account. /player (PlayerCharacters) tells the
  logged-in player if they haven't linked a game account (with the [link code
  prompt) or, once linked, shows their characters grouped by account; each
  character opens its sheet at /player/char/:serial. Account security moved into
  the same shell (the buried "Game accounts" block was removed from it).
  Login/register now land on /player.
- Public: GET /public/shard/online (redacted name+serial+map) drives an
  "Online now" list on /site/shard that links to public character sheets at
  /site/shard/char/:serial (ShardChar). Swagger: ShardOnlinePlayer + regenerated.
- api.shard.online added.

Verified live against the running shard: Darrow's full sheet (STR 120, 58
skills, 3 equipment) renders through the browser-facing proxy; the online list
returns the live roster; player routes 401 without a session.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011qPmpmVH1xGCiZoz9m9vW3

client/src/routes/player/PlayerRegister.jsx

@@ -21,7 +21,7 @@ export default function PlayerRegister() {
   const [providers, setProviders] = useState([])
 
   useEffect(() => {
-    if (user && user.role === 'player') navigate('/account', { replace: true })
+    if (user && user.role === 'player') navigate('/player', { replace: true })
   }, [user, navigate])
 
   useEffect(() => {
@@ -51,7 +51,7 @@ export default function PlayerRegister() {
     setBusy(true)
     try {
       await register(username.trim(), password, { email: email.trim() || undefined, company })
-      navigate('/account', { replace: true })
+      navigate('/player', { replace: true })
     } catch (err) {
       if (err.status === 409) setError('That username is already taken.')
       else if (err.status === 403) setError('Registration is not open right now.')