Polish: plain unfound word-search chips + no signed-out flash on refresh

- Word Search: unfound words were tinted (accent-soft background) like found
  ones, so the remaining words were hard to spot as the board filled. Unfound
  chips are now plain (transparent + a light outline); found words keep their
  grid colour. Easy to see what's left.
- Auth: a refresh briefly flashed the signed-out header until /api/auth/me
  returned. Now the last-known user is cached and hydrated immediately, so the
  signed-in UI paints at once; the session is still revalidated every load (a
  stale/expired one corrects within a beat) and the cache is cleared on logout.

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

frontend/src/lib/auth.svelte.js

@@ -2,7 +2,22 @@
 import { SvelteSet } from 'svelte/reactivity';
 import { getJSON, postJSON, delJSON } from './api.js';
 
-export const auth = $state({ user: null, ready: false });
+// Cache the last-known user so a refresh paints the signed-in UI immediately
+// instead of flashing "signed out" for the /api/auth/me round-trip. The session
+// is still revalidated on every load (see refresh) — a stale/expired one just
+// corrects within a beat instead of greeting you logged-out every time.
+const AUTH_CACHE = 'goodnews:auth_user';
+function _loadUser() {
+  try { return JSON.parse(localStorage.getItem(AUTH_CACHE) || 'null'); } catch { return null; }
+}
+function _saveUser(u) {
+  try {
+    if (u) localStorage.setItem(AUTH_CACHE, JSON.stringify(u));
+    else localStorage.removeItem(AUTH_CACHE);
+  } catch { /* ignore */ }
+}
+
+export const auth = $state({ user: _loadUser(), ready: false });
 export const savedIds = new SvelteSet(); // reactive set of saved article ids
 export const followKeys = new SvelteSet(); // reactive set of "kind:value" follows
 
@@ -16,6 +31,7 @@ export async function refresh() {
     auth.user = null;
   } finally {
     auth.ready = true;
+    _saveUser(auth.user);
   }
   if (auth.user) { await loadSaved(); await loadFollows(); }
   else { savedIds.clear(); followKeys.clear(); }
@@ -99,6 +115,7 @@ export async function logout() {
 // e.g. after delete-account or sign-out-everywhere).
 export function clearLocal() {
   auth.user = null;
+  _saveUser(null);
   savedIds.clear();
   followKeys.clear();
 }

frontend/src/lib/components/WordSearchGame.svelte

@@ -221,8 +221,12 @@
   .plabel { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.62rem; font-family: var(--label);
             color: var(--muted); text-align: center; margin: 0 0 10px; }
   .words { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; padding: 0; margin: 0; }
+  /* Unfound words are plain (transparent + outline) so it's easy to see what's
+     left as the board fills; found words get their grid colour via inline style. */
   .words li { font-family: var(--label); font-size: 0.82rem; letter-spacing: 0.04em; color: var(--ink);
-              padding: 4px 11px; border-radius: 999px; background: var(--accent-soft); transition: background 0.2s ease; }
+              padding: 4px 11px; border-radius: 999px; background: transparent;
+              border: 1px solid var(--line); transition: background 0.2s ease, border-color 0.2s ease; }
+  .words li.got { border-color: transparent; }
   .hint { text-align: center; color: var(--muted); font-size: 0.84rem; margin: 0; }
   .result { text-align: center; }
   .rmark { font-family: var(--serif); font-style: italic; color: var(--accent-deep); font-size: 1.2rem; margin: 0 0 12px; }