feat(growth): same-day 1-day baselines for new videos

Let 1-day view growth use a zero baseline for videos published today, and the first successful sample for older videos ingested today, without mixing those into 7/30-day rankings.

reaction_board/web/static/components.js

@@ -30,6 +30,12 @@ export function avatar(item, className = "avatar") {
     loading="lazy" referrerpolicy="no-referrer"></div>`;
 }
 
+function growthBaselineTag(growth) {
+  if (growth?.baseline === "zero") return "<small>今日</small>";
+  if (growth?.baseline === "open") return "<small>入库后</small>";
+  return "";
+}
+
 export function videoCard(item, {
   rank = null, primary = "view", primaryLabel = "", primaryText = null,
   showStatus = false,
@@ -73,7 +79,7 @@ export function videoCard(item, {
           <span class="primary-stat">
             <b>${escapeHtml(primaryValue ?? "—")}</b><small>${escapeHtml(label)}</small>
           </span>
-          ${delta !== null ? `<span class="delta ${delta >= 0 ? "up" : "down"}">${formatDelta(delta)}</span>` : ""}
+          ${delta !== null ? `<span class="delta ${delta >= 0 ? "up" : "down"}">${formatDelta(delta)}${growthBaselineTag(growth)}</span>` : ""}
           <span class="secondary-stat">互动 ${formatPercent(item.interaction_rate)}</span>
         </div>
       </div>
@@ -118,7 +124,7 @@ export function metricGrid(item) {
   return `<div class="metric-grid">
     ${["view", "like", "coin", "favorite", "share", "reply", "danmaku"].map((metric) => {
       const extra = metric === "view" && growth?.available
-        ? `<span class="metric-delta ${growth.delta >= 0 ? "up" : "down"}">${formatDelta(growth.delta)}</span>`
+        ? `<span class="metric-delta ${growth.delta >= 0 ? "up" : "down"}">${formatDelta(growth.delta)}${growthBaselineTag(growth)}</span>`
         : "";
       return `<div class="metric-cell">
         <span class="metric-label">${escapeHtml(metricLabel(metric))}</span>