feat: skeleton cards + tab fade + modal pop animation + scrollbar polish

Visual-polish round 2.

- VOD skeleton loader: replaces the "Loading..." placeholder with
  six shimmering skeleton cards that share the real cards
  dimensions. The grid no longer collapses+expands as VODs arrive,
  and the shimmer telegraphs that work is happening rather than
  the app sitting silent. CSS @keyframes skel-shimmer drives a
  smooth 1.5s gradient pan.

- Tab switch animation: 180ms ease-out fade-in + 4px lift on
  every .tab-content.active. Switching between VODs / Statistik /
  Archiv / Einstellungen no longer feels like an instant
  paint-swap.

- Modal overhaul: backdrop-filter blur(8px) on the overlay so the
  app behind softly blurs out, animated pop on the modal itself
  (scale 0.96 -> 1 + translateY 8px -> 0 with a clean spring
  curve), proper bordered + glow-cornered card, and the close X
  swapped from a flat 24px text button to a real 30x30 rounded
  pill with hover-red highlight.

- Scrollbar: thin 10px purple-tinted webkit scrollbar across the
  entire app, matching the accent color. Hover deepens to full
  purple. Track is near-transparent. Looks intentional instead of
  the default OS gray.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/renderer-streamers.ts

@@ -682,7 +682,19 @@ async function selectStreamer(name: string, forceRefresh = false): Promise<void>
         updateStatus(UI_TEXT.status.noLogin, false);
     }
 
-    byId('vodGrid').innerHTML = `<div class="empty-state"><p>${UI_TEXT.vods.loading}</p></div>`;
+    // Skeleton loader — six placeholder cards while VODs come in. Much
+    // less jarring than a "Loading..." text block in an otherwise blank
+    // grid. Shimmer animation is in CSS.
+    byId('vodGrid').innerHTML = Array.from({ length: 6 }, () => `
+        <div class="vod-card vod-card-skeleton">
+            <div class="vod-skel-thumb"></div>
+            <div class="vod-info">
+                <div class="vod-skel-line" style="width: 85%;"></div>
+                <div class="vod-skel-line" style="width: 55%; margin-top: 8px; height: 10px;"></div>
+                <div class="vod-skel-line" style="width: 40%; margin-top: 6px; height: 10px;"></div>
+            </div>
+        </div>
+    `).join('');
 
     const userId = await window.api.getUserId(name);
     if (isStaleRequest()) {

src/styles.css

@@ -166,6 +166,80 @@ body {
     font-weight: 600;
 }
 
+/* ============================================
+   VOD SKELETON CARDS — shown while VODs load
+   ============================================ */
+.vod-card-skeleton {
+    cursor: default;
+    pointer-events: none;
+    border-color: transparent !important;
+    box-shadow: none !important;
+    transform: none !important;
+}
+
+.vod-card-skeleton .vod-skel-thumb {
+    width: 100%;
+    aspect-ratio: 16/9;
+    background: linear-gradient(90deg, var(--bg-elevated) 0%, rgba(255,255,255,0.04) 50%, var(--bg-elevated) 100%);
+    background-size: 200% 100%;
+    animation: skel-shimmer 1.5s linear infinite;
+}
+
+.vod-card-skeleton .vod-skel-line {
+    height: 14px;
+    background: linear-gradient(90deg, var(--bg-elevated) 0%, rgba(255,255,255,0.06) 50%, var(--bg-elevated) 100%);
+    background-size: 200% 100%;
+    border-radius: 3px;
+    animation: skel-shimmer 1.5s linear infinite;
+}
+
+@keyframes skel-shimmer {
+    0%   { background-position: 200% 0; }
+    100% { background-position: -200% 0; }
+}
+
+/* ============================================
+   TAB SWITCH FADE — subtle 180ms ease-in
+   ============================================ */
+.tab-content.active {
+    animation: tab-fade-in 0.18s ease-out;
+}
+
+@keyframes tab-fade-in {
+    from { opacity: 0; transform: translateY(4px); }
+    to   { opacity: 1; transform: translateY(0); }
+}
+
+/* ============================================
+   SCROLLBAR — twitch-themed, thin, subtle
+   ============================================ */
+*::-webkit-scrollbar {
+    width: 10px;
+    height: 10px;
+}
+
+*::-webkit-scrollbar-track {
+    background: rgba(255, 255, 255, 0.02);
+}
+
+*::-webkit-scrollbar-thumb {
+    background: rgba(145, 70, 255, 0.25);
+    border-radius: 5px;
+    border: 2px solid transparent;
+    background-clip: padding-box;
+    transition: background 0.2s;
+}
+
+*::-webkit-scrollbar-thumb:hover {
+    background: rgba(145, 70, 255, 0.55);
+    background-clip: padding-box;
+    border: 2px solid transparent;
+}
+
+*::-webkit-scrollbar-corner {
+    background: transparent;
+}
+
 .add-streamer {
     padding: 10px;
     display: flex;
@@ -1836,45 +1910,77 @@ body.theme-light .modal {
     left: 0;
     right: 0;
     bottom: 0;
-    background: rgba(0, 0, 0, 0.7);
+    background: rgba(0, 0, 0, 0.65);
     display: none;
     justify-content: center;
     align-items: center;
     z-index: 1000;
+    backdrop-filter: blur(8px);
+    -webkit-backdrop-filter: blur(8px);
+    animation: modal-overlay-fade 0.2s ease-out;
 }
 
 .modal-overlay.show {
     display: flex;
 }
 
+@keyframes modal-overlay-fade {
+    from { opacity: 0; }
+    to   { opacity: 1; }
+}
+
 .modal {
     background: var(--bg-card);
-    border-radius: 12px;
+    border: 1px solid var(--border-soft);
-    padding: 25px;
+    border-radius: 14px;
+    padding: 25px 28px;
     width: 90%;
     max-width: 500px;
     max-height: 90vh;
     overflow-y: auto;
+    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(145, 70, 255, 0.10);
+    animation: modal-pop 0.22s cubic-bezier(0.16, 1, 0.3, 1);
+    position: relative;
+}
+
+@keyframes modal-pop {
+    from { opacity: 0; transform: scale(0.96) translateY(8px); }
+    to   { opacity: 1; transform: scale(1) translateY(0); }
 }
 
 .modal h2 {
-    margin-bottom: 20px;
+    margin-bottom: 18px;
     font-size: 18px;
+    font-weight: 600;
+    letter-spacing: -0.2px;
+    color: var(--text);
 }
 
 .modal-close {
-    float: right;
+    position: absolute;
-    background: none;
+    top: 14px;
-    border: none;
+    right: 14px;
+    width: 30px;
+    height: 30px;
+    background: transparent;
+    border: 1px solid var(--border-soft);
+    border-radius: 8px;
     color: var(--text-secondary);
-    font-size: 24px;
+    font-size: 16px;
     cursor: pointer;
     padding: 0;
     line-height: 1;
+    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.12s;
 }
 
 .modal-close:hover {
-    color: var(--text);
+    color: #fff;
+    background: rgba(255, 70, 70, 0.18);
+    border-color: rgba(255, 70, 70, 0.55);
+}
+
+.modal-close:active {
+    transform: scale(0.92);
 }
 
 .slider-group {