feat: 站点单页、时间线导入与行级 BBCode 短代码

首页右栏接入单页入口与公告置顶/全部页；Markdown 编辑器支持可视化时间线与 Git 导入；隐藏块改为 [hide]/[timeline] 命名闭合，并修复单页/公告 GORM 更新只改 updated_at 的问题。

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

frontend/lib/timelineBlocks.ts

@@ -0,0 +1,140 @@
+/** 正文 [timeline]…[/timeline] 块解析与序列化 */
+
+export type TimelineItem = {
+  date: string;
+  title: string;
+  body: string;
+  sourceUrl?: string;
+  /** 导入勾选；手填项默认 true */
+  selected?: boolean;
+};
+
+export type TimelineDayGroup = {
+  date: string;
+  items: TimelineItem[];
+};
+
+const GIT_COMMENT_RE = /^<!--\s*git:\s*(https?:\/\/\S+)\s*-->\s*$/i;
+const HEADING_RE = /^##\s+(\d{4}-\d{2}-\d{2})\s+(.+)$/;
+
+/** 去掉控制字符与 RTL 覆盖，截断长度 */
+export function sanitizeTimelineText(raw: string, max: number): string {
+  let s = raw
+    .replace(/[\u0000-\u0008\u000B\u000C\u000E-\u001F\u007F]/g, "")
+    .replace(/[\u202A-\u202E\u2066-\u2069]/g, "");
+  if ([...s].length > max) {
+    s = [...s].slice(0, max).join("");
+  }
+  return s;
+}
+
+function isDirectiveLine(t: string): boolean {
+  const lower = t.toLowerCase();
+  return (
+    lower === "[/hide]" ||
+    lower === "[/timeline]" ||
+    lower === "[timeline]" ||
+    lower.startsWith("[hide") ||
+    t.startsWith("<!-- git:")
+  );
+}
+
+/** 避免导入文本拆坏指令块：危险独立行加前缀空格 */
+export function neutralizeDirectiveLines(text: string): string {
+  return text
+    .split("\n")
+    .map((line) => {
+      const t = line.trim();
+      if (isDirectiveLine(t)) {
+        return " " + line;
+      }
+      return line;
+    })
+    .join("\n");
+}
+
+/** 标题行：去掉换行，防止拆项 */
+export function sanitizeTimelineTitle(title: string): string {
+  return sanitizeTimelineText(title.replace(/[\r\n]+/g, " ").trim(), 200);
+}
+
+export function parseTimelineBody(body: string): TimelineItem[] {
+  const lines = body.replace(/\r\n/g, "\n").replace(/\r/g, "\n").split("\n");
+  const items: TimelineItem[] = [];
+  let cur: TimelineItem | null = null;
+  let bodyBuf: string[] = [];
+
+  const flush = () => {
+    if (!cur) return;
+    let sourceUrl: string | undefined;
+    const kept: string[] = [];
+    for (const line of bodyBuf) {
+      const m = line.trim().match(GIT_COMMENT_RE);
+      if (m) {
+        sourceUrl = m[1];
+        continue;
+      }
+      kept.push(line);
+    }
+    cur.body = kept.join("\n").replace(/^\n+/, "").replace(/\n+$/, "");
+    if (sourceUrl) cur.sourceUrl = sourceUrl;
+    items.push(cur);
+    cur = null;
+    bodyBuf = [];
+  };
+
+  for (const line of lines) {
+    const m = line.match(HEADING_RE);
+    if (m) {
+      flush();
+      cur = {
+        date: m[1],
+        title: sanitizeTimelineTitle(m[2]),
+        body: "",
+        selected: true,
+      };
+      continue;
+    }
+    if (cur) bodyBuf.push(line);
+  }
+  flush();
+  return items;
+}
+
+export function serializeTimelineBlock(items: TimelineItem[]): string {
+  const parts = items
+    .filter((it) => it.selected !== false)
+    .map((it) => {
+      const date = /^\d{4}-\d{2}-\d{2}$/.test(it.date)
+        ? it.date
+        : new Date().toISOString().slice(0, 10);
+      const title = sanitizeTimelineTitle(it.title) || "未命名";
+      const body = neutralizeDirectiveLines(sanitizeTimelineText(it.body || "", 2000));
+      const lines = [`## ${date} ${title}`];
+      if (body.trim()) lines.push(body.trimEnd());
+      if (it.sourceUrl && /^https:\/\//i.test(it.sourceUrl)) {
+        lines.push(`<!-- git: ${it.sourceUrl} -->`);
+      }
+      return lines.join("\n");
+    });
+  return `[timeline]\n${parts.join("\n\n")}\n[/timeline]`;
+}
+
+export function groupTimelineByDate(items: TimelineItem[]): TimelineDayGroup[] {
+  const map = new Map<string, TimelineItem[]>();
+  const order: string[] = [];
+  for (const it of items) {
+    const d = it.date || "未知日期";
+    if (!map.has(d)) {
+      map.set(d, []);
+      order.push(d);
+    }
+    map.get(d)!.push(it);
+  }
+  order.sort((a, b) => (a < b ? 1 : a > b ? -1 : 0));
+  return order.map((date) => ({ date, items: map.get(date)! }));
+}
+
+export function isLikelyMergeCommit(title: string): boolean {
+  return /^merge\b/i.test(title.trim()) || /^合并\b/.test(title.trim());
+}