feat: add Journal server documentation to DocDialog

Introduce a new documentation set for Journal server functionality,
including a dropdown selector in the DocDialog to switch between
"directives" and "journal" documentation modes.

src/components/journal-doc-data.ts

@@ -0,0 +1,57 @@
+import yaml from "js-yaml";
+
+export interface JournalDocEntry {
+  tag: string;
+  icon: string;
+  title: string;
+  description: string;
+  syntax: string;
+  props: { name: string; type: string; default?: string; desc: string }[];
+  body: string;
+}
+
+function parseFrontmatter(raw: string): Record<string, unknown> | null {
+  const normalized = raw.replace(/\r\n/g, "\n");
+  const match = normalized.match(/^---\n([\s\S]*?)\n---\n?([\s\S]*)$/);
+  if (!match) return null;
+  try {
+    return yaml.load(match[1]) as Record<string, unknown>;
+  } catch {
+    return null;
+  }
+}
+
+function getBody(raw: string): string {
+  const normalized = raw.replace(/\r\n/g, "\n");
+  const match = normalized.match(/^---\n[\s\S]*?\n---\n?([\s\S]*)$/);
+  return match ? match[1] : raw;
+}
+
+function parseEntry(raw: string): JournalDocEntry | null {
+  const fm = parseFrontmatter(raw);
+  if (!fm) return null;
+  return {
+    tag: fm.tag as string,
+    icon: fm.icon as string,
+    title: fm.title as string,
+    description: fm.description as string,
+    syntax: fm.syntax as string,
+    props: (fm.props as JournalDocEntry["props"]) ?? [],
+    body: getBody(raw),
+  };
+}
+
+import journalGmRaw from "../doc-entries/journal-gm.md";
+import journalPlayerRaw from "../doc-entries/journal-player.md";
+
+const rawDocuments: string[] = [journalGmRaw, journalPlayerRaw];
+
+let _entries: JournalDocEntry[] | null = null;
+
+function loadJournalDocEntries(): JournalDocEntry[] {
+  if (_entries) return _entries;
+  _entries = rawDocuments.map(parseEntry).filter(Boolean) as JournalDocEntry[];
+  return _entries;
+}
+
+export const journalDocEntries = loadJournalDocEntries();