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/i18n/coverage-check.mjs

@@ -39,6 +39,7 @@ const RULES = [
   ['codex.rarity.', RARITY],
   ['codex.sort.', ['recent', 'contacted']],
   ['codex.form.', ['wisp', 'banshee', 'fairy', 'shade']],
+  ['log.counts.', ['question', 'anomaly', 'utterance']],
   ['landing.stats.', ['entities', 'sessions', 'utterances', 'anomalies']],
   ['landing.modes.', ['radio', 'evp', 'wire', 'ouija']],
   ['shop.modules.', ['emfArray', 'geophone', 'spiritMic', 'uvIlluminator']],