Add TTRPG Player marketing landing site.

React/Vite landing with RU/EN i18n, live USD pricing, download links to updates.mailib.ru, and donate.stream checkout.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/ui/Button.module.css

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+.button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  padding: 12px 22px;
+  border-radius: var(--radius-md);
+  border: 1px solid transparent;
+  font-size: 15px;
+  font-weight: 600;
+  line-height: 1.2;
+  cursor: pointer;
+  transition:
+    background 0.2s ease,
+    border-color 0.2s ease,
+    transform 0.15s ease,
+    box-shadow 0.2s ease;
+  white-space: nowrap;
+}
+
+.button:hover {
+  transform: translateY(-1px);
+}
+
+.primary {
+  background: linear-gradient(135deg, var(--color-purple) 0%, #6d28d9 100%);
+  color: #fff;
+  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.35);
+}
+
+.primary:hover {
+  box-shadow: 0 6px 28px rgba(124, 58, 237, 0.45);
+}
+
+.secondary {
+  background: transparent;
+  border-color: var(--color-border-strong);
+  color: var(--color-gold-bright);
+}
+
+.secondary:hover {
+  background: rgba(200, 161, 102, 0.08);
+}
+
+.gold {
+  background: linear-gradient(135deg, #d4a85a 0%, var(--color-gold) 100%);
+  color: #1a1208;
+  box-shadow: 0 4px 16px rgba(200, 161, 102, 0.25);
+}
+
+.ghost {
+  background: rgba(255, 255, 255, 0.04);
+  border-color: var(--color-border);
+  color: var(--color-text);
+}
+
+.ghost:hover {
+  background: rgba(255, 255, 255, 0.08);
+}