feat: Discord-style glass morphism UI redesign + nightly CI/CD

- App shell: gradient title, glass admin modal, avatar, admin login/logout
- All plugin empty states: floating icon animations, updated typography
- Soundboard: orange accent theme replacing blurple default
- Global styles: glass morphism variables, Discord-dark color palette
- CI/CD: nightly deploy (stops main, starts nightly on port 8085) + manual restore-main job

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/plugins/watch-together/watch-together.css

@@ -161,23 +161,26 @@
 
 /* ── Empty state ── */
 .wt-empty {
-  text-align: center;
-  padding: 60px 20px;
-  color: var(--text-muted);
+  flex: 1; display: flex; flex-direction: column;
+  align-items: center; justify-content: center; gap: 16px;
+  padding: 40px; height: 100%;
 }
 .wt-empty-icon {
-  font-size: 48px;
-  margin-bottom: 12px;
-  opacity: 0.4;
+  font-size: 64px; line-height: 1;
+  filter: drop-shadow(0 0 20px rgba(230,126,34,0.5));
+  animation: wt-float 3s ease-in-out infinite;
+}
+@keyframes wt-float {
+  0%, 100% { transform: translateY(0); }
+  50% { transform: translateY(-8px); }
 }
 .wt-empty h3 {
-  font-size: 18px;
-  font-weight: 600;
-  color: var(--text-normal);
-  margin-bottom: 6px;
+  font-size: 26px; font-weight: 700; color: #f2f3f5;
+  letter-spacing: -0.5px; margin: 0;
 }
 .wt-empty p {
-  font-size: 14px;
+  font-size: 15px; color: #80848e;
+  text-align: center; max-width: 360px; line-height: 1.5; margin: 0;
 }
 
 /* ── Error ── */