refactor(admin): share the GitHub release history between desktop and phone

useGithubReleases holds the paged fetch, the prerelease filter, the expanded rows and the date format, and parseReleaseNotes splits a release body into the blocks both panels draw. The phone keeps its page walk past hidden prereleases through the fillPages option, its repository link and its own inline link scan; the desktop keeps one page per load.

client/src/utils/releaseNotes.ts

@@ -0,0 +1,48 @@
+/** One block of a release body: a heading, a paragraph, or a run of list items. */
+export type ReleaseNoteBlock = { kind: 'h3' | 'h4' | 'p'; text: string } | { kind: 'ul'; items: string[] };
+
+/** Escapes the characters that would let release text break out of the HTML it is placed in. */
+export function escapeReleaseHtml(str: string): string {
+  return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
+}
+
+/**
+ * Splits a GitHub release body into the blocks both admin shells render: `### ` and `## `
+ * headings, `- ` or `* ` list items gathered into one list until anything else breaks the
+ * run, and every other non-empty line as a paragraph. Blank lines only end a list. The
+ * text stays raw; each shell formats it inline itself.
+ */
+export function parseReleaseNotes(body: string): ReleaseNoteBlock[] {
+  const blocks: ReleaseNoteBlock[] = [];
+  let listItems: string[] = [];
+
+  const flushList = () => {
+    if (listItems.length > 0) {
+      blocks.push({ kind: 'ul', items: listItems });
+      listItems = [];
+    }
+  };
+
+  for (const line of body.split('\n')) {
+    const trimmed = line.trim();
+    if (!trimmed) {
+      flushList();
+      continue;
+    }
+
+    if (trimmed.startsWith('### ')) {
+      flushList();
+      blocks.push({ kind: 'h4', text: trimmed.slice(4) });
+    } else if (trimmed.startsWith('## ')) {
+      flushList();
+      blocks.push({ kind: 'h3', text: trimmed.slice(3) });
+    } else if (/^[-*] /.test(trimmed)) {
+      listItems.push(trimmed.slice(2));
+    } else {
+      flushList();
+      blocks.push({ kind: 'p', text: trimmed });
+    }
+  }
+  flushList();
+  return blocks;
+}