feat(landing): rework — es default, 2-step join, roster + account polish

- Default language Spanish at root /, English moves to /en/ (eu unchanged):
  getStaticPaths {lang:undefined}->es + LANG_*_PATH maps swapped in ui.ts.
- Section order: hero -> join -> status -> members -> mods -> features.
- Join flow 3 -> 2 steps (drop the Connect/IP step; launcher handles the
  address). Remove the hero IP CopyChip. Header CTA renamed Play/Jugar/Jolastu
  and gains Register + Login links on all four pages.
- Account page: hide the whole login block once authenticated (not just the
  form), add an avatar Refresh button (cache-busted NMSR re-fetch), flatten the
  avatar (no bevel). New i18n key account.refresh.
- Register page: new REGISTRATION_SHOW_INVITE env (default false/hidden) toggles
  the invite-code field independently of the REGISTRATION_MODE backend gate.
- Members roster: drop the `admin` account, render full-body via a new
  ROSTER_AVATAR_MODE (default fullbodyiso); portrait tiles.
- Style: flatten emboss on feature icons (.picon) + player tiles (.roster-tile).
  PixelIcon gains optional image support (/icons/<name>.png|svg).
- Favicon now /favicon.png (committed) on all pages.
- Docs: plan/09-landing.md Assets section (logo/favicon/features-icons drop
  points) + default-language note; .env.example documents the two new vars.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

landing/src/pages/[...lang]/fjord.astro

@@ -6,6 +6,8 @@ import {
   LANG_LABEL,
   LANG_PATH,
   LANG_FJORD_PATH,
+  LANG_REGISTER_PATH,
+  LANG_ACCOUNT_PATH,
   type Lang,
 } from "../../i18n/ui";
 import Creeper from "../../components/Creeper.astro";
@@ -16,8 +18,8 @@ import "../../styles/main.css";
 // alternative manual path — intentionally NOT linked from the homepage nav.
 export function getStaticPaths() {
   return [
-    { params: { lang: undefined }, props: { locale: "en" as Lang } },
-    { params: { lang: "es" }, props: { locale: "es" as Lang } },
+    { params: { lang: undefined }, props: { locale: "es" as Lang } },
+    { params: { lang: "en" }, props: { locale: "en" as Lang } },
     { params: { lang: "eu" }, props: { locale: "eu" as Lang } },
   ];
 }
@@ -28,6 +30,8 @@ const f = t.fjord;
 const { theme, fjord } = site;
 const headFont = HEAD_FONTS[theme.headFont] ?? HEAD_FONTS.pixelify;
 const homePath = LANG_PATH[locale];
+const registerPath = LANG_REGISTER_PATH[locale];
+const accountPath = LANG_ACCOUNT_PATH[locale];
 const fjordPack = site.launcherManifest.fjordPack;
 ---
 
@@ -43,7 +47,7 @@ const fjordPack = site.launcherManifest.fjordPack;
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <title>{site.name} — {f.title}</title>
     <meta name="description" content={f.lead} />
-    <link rel="icon" type="image/png" href="/logo.png" />
+    <link rel="icon" type="image/png" href="/favicon.png" />
     <link rel="stylesheet" href="/fonts/fonts.css" />
     {LANGS.map((l) => <link rel="alternate" hreflang={l} href={LANG_FJORD_PATH[l]} />)}
   </head>
@@ -68,6 +72,8 @@ const fjordPack = site.launcherManifest.fjordPack;
             >{LANG_LABEL[l]}</a>
           ))}
         </div>
+        <a class="mc-btn sm" href={registerPath}>{t.nav.register}</a>
+        <a class="mc-btn sm" href={accountPath}>{t.nav.login}</a>
         <a class="mc-btn primary sm" href={`${homePath}#join`}>{t.nav.play}</a>
       </div>
     </header>