polish(frontend): 侧栏与徽章可读性，智能悬停提示

降权全站字重；优化右栏公告/数据块；类型状态徽章用固定浅色区分；TipHost 仅在文案不一致、非文字或省略时显示。

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

frontend/lib/postMeta.ts

@@ -59,3 +59,31 @@ export function typeStatusLabel(postType?: string, typeStatus?: string): string
       return "";
   }
 }
+
+/** 状态徽章 CSS class（浅色区分） */
+export function typeStatusClass(postType?: string, typeStatus?: string): string {
+  const pt = normalizePostType(postType);
+  const s = (typeStatus || "").toLowerCase();
+  let kind = "open";
+  switch (pt) {
+    case "question":
+      kind = s === "solved" ? "solved" : "unsolved";
+      break;
+    case "poll":
+      kind = s === "closed" ? "closed" : "open";
+      break;
+    case "bounty":
+      if (s === "solved") kind = "solved";
+      else if (s === "expired") kind = "expired";
+      else kind = "open";
+      break;
+    case "lottery":
+      if (s === "drawn") kind = "drawn";
+      else if (s === "closed") kind = "closed";
+      else kind = "open";
+      break;
+    default:
+      return "";
+  }
+  return `badge-status badge-status-${kind}`;
+}