fix: pre-launch UI hardening + KOL reduce-action type, proxy IP relay, settings redesign

Frontend half of the pre-launch audit campaign:

- types/index.ts + kol/KolPageClient.tsx: add missing 'reduce' KolAction
  (backend emits it; frontend lacked the type + color/label maps → undefined
  styling). Adds ACTION_COLOR/actionLabel/postActionLabel entries.
- proxy/[...path]/route.ts: relay real client IP (x-forwarded-for / x-real-ip)
  so the backend rate limiter buckets per-user instead of per-Next-server (BUG-02).
- Settings/BotConfigPanel redesign, paper-mode clarity, copy cleanup.
- Assorted page/display fixes, loading states, Pagination component.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

components/nav/Navbar.tsx

@@ -136,6 +136,7 @@ export default function Navbar() {
             key={tab.key}
             href={`/${locale}${tab.key === '/' ? '' : tab.key}`}
             className={`nav-tab ${isActive(tab.key) ? 'active' : ''}`}
+            prefetch
           >
             {tab.label}
           </Link>