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

server/src/router/v1/public/public.routes.js

@@ -162,6 +162,13 @@ publicRouter.get(
   validate,
   shard.getEconomy,
 )
+publicRouter.get(
+  '/shard/online',
+  // #swagger.tags = ['Public · Shard']
+  // #swagger.summary = 'Players online now (name + serial + map only)'
+  /* #swagger.responses[200] = { description: 'Online players', content: { "application/json": { schema: { type: "array", items: { $ref: "#/components/schemas/ShardOnlinePlayer" } } } } } */
+  shard.getOnline,
+)
 publicRouter.get(
   '/shard/idoc',
   // #swagger.tags = ['Public · Shard']