feat: presence beyond the tab — PWA manifest and the Ghost Log recap

Usability wave Workstream C (#5, #7):
- manifest.webmanifest with existing 192/512/180 icons, linked in
  index.html with theme-color aligned to #07070d; no service worker.
- GET /api/seances/recent: last 12 of the seeker's own séances with
  entity, per-kind event counts (one GROUP BY) and up to 3 spirit
  echoes (one windowed query) — no per-session N+1.
- /log Ghost Log page: cards with GhostGlyph, relative in-fiction
  timestamps, counts and echo lines; LOG link in the séance topbar;
  en/es i18n parity.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -9,6 +9,7 @@ import { CodexEntityPage } from './pages/CodexEntityPage'
 import { CodexPage } from './pages/CodexPage'
 import { DevicesPage } from './pages/DevicesPage'
 import { EnterPage } from './pages/EnterPage'
+import { GhostLogPage } from './pages/GhostLogPage'
 import { InventoryPage } from './pages/InventoryPage'
 import { LandingPage } from './pages/LandingPage'
 import { SeancePage } from './pages/SeancePage'
@@ -28,6 +29,7 @@ function App() {
           <Route path="/" element={<LandingPage />} />
           <Route path="/enter" element={<EnterPage />} />
           <Route path="/seance" element={<SeancePage />} />
+          <Route path="/log" element={<GhostLogPage />} />
           <Route path="/codex" element={<CodexPage />} />
           <Route path="/codex/:id" element={<CodexEntityPage />} />
           <Route path="/shop" element={<ShopPage />} />