feat(travel): VideoTab 플레이스홀더 — 영상 탭 UI 셸

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

src/pages/travel/VideoTab.css

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+/* ── VideoTab placeholder ── */
+
+.video-tab {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  min-height: 300px;
+  gap: 12px;
+  padding: 40px 20px;
+}
+
+.video-tab__icon {
+  color: var(--tv-dim);
+}
+
+.video-tab__title {
+  margin: 0;
+  font: 600 20px/1.3 var(--tv-serif);
+  color: var(--tv-text);
+}
+
+.video-tab__desc {
+  margin: 0;
+  font: 11px var(--tv-mono);
+  letter-spacing: 0.06em;
+  color: var(--tv-muted);
+}

src/pages/travel/VideoTab.jsx

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+import React from 'react';
+import './VideoTab.css';
+
+export default function VideoTab() {
+  return (
+    <div className="video-tab">
+      <svg
+        className="video-tab__icon"
+        width="48"
+        height="48"
+        viewBox="0 0 48 48"
+        fill="none"
+        xmlns="http://www.w3.org/2000/svg"
+        aria-hidden="true"
+      >
+        <rect
+          x="4"
+          y="10"
+          width="30"
+          height="28"
+          rx="4"
+          stroke="currentColor"
+          strokeWidth="2"
+        />
+        <path
+          d="M34 18l10-6v24l-10-6V18z"
+          stroke="currentColor"
+          strokeWidth="2"
+          strokeLinejoin="round"
+        />
+        <circle cx="19" cy="24" r="6" stroke="currentColor" strokeWidth="2" />
+        <path
+          d="M17 24l4-2.5v5L17 24z"
+          fill="currentColor"
+        />
+      </svg>
+
+      <h2 className="video-tab__title">영상 기능 준비 중</h2>
+      <p className="video-tab__desc">
+        여행 영상을 감상할 수 있는 기능이 곧 추가됩니다.
+      </p>
+    </div>
+  );
+}