feat(sponsors): add /sponsors page, homepage promo, and in-app strip

app/src/components/ServerTab/AboutPage.tsx

@@ -3,6 +3,7 @@ import type { CSSProperties, ReactNode } from 'react';
 import { useEffect, useState } from 'react';
 import { Trans, useTranslation } from 'react-i18next';
 import voiceboxLogo from '@/assets/voicebox-logo.png';
+import { SPONSORS } from '@/lib/sponsors';
 import { usePlatform } from '@/platform/PlatformContext';
 
 function FadeIn({ delay = 0, children }: { delay?: number; children: ReactNode }) {
@@ -116,7 +117,37 @@ export function AboutPage() {
             </div>
           </FadeIn>
 
-          <FadeIn delay={400}>
+          {SPONSORS.length > 0 && (
+            <FadeIn delay={400}>
+              <div className="pt-4 flex flex-col items-center gap-3">
+                <p className="text-[10px] font-semibold uppercase tracking-[0.22em] text-muted-foreground/60">
+                  Sponsored by
+                </p>
+                <div className="flex flex-wrap items-center justify-center gap-3">
+                  {SPONSORS.map((sponsor) => (
+                    <a
+                      key={sponsor.name}
+                      href={sponsor.url}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      aria-label={sponsor.name}
+                      className="group flex h-12 min-w-[120px] items-center justify-center rounded-lg border border-border/60 bg-card/50 px-4 transition-colors hover:bg-muted/50"
+                    >
+                      <img
+                        src={sponsor.logoSrc}
+                        alt={sponsor.logoAlt ?? sponsor.name}
+                        className={`h-5 w-auto max-w-[100px] object-contain opacity-80 transition-opacity group-hover:opacity-100 ${
+                          sponsor.invertOnDark ? 'dark:brightness-0 dark:invert' : ''
+                        }`}
+                      />
+                    </a>
+                  ))}
+                </div>
+              </div>
+            </FadeIn>
+          )}
+
+          <FadeIn delay={480}>
             <p className="text-xs text-muted-foreground/40 pt-4">
               <Trans
                 i18nKey="settings.about.license"