Redo /newsletter and /nuggets pages; add Nuggets episode tags with admin editor; v2.37.0

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/data.js

@@ -37,6 +37,7 @@ import {
   WEBHOOKS_FILE,
   STUDY_SESSIONS_FILE,
   NEWSLETTER_ISSUES_FILE,
+  NUGGETS_TAGS_FILE,
   EMPTY_HIT_STATS,
   EMPTY_VISITOR_STATS,
   DEFAULT_REPLY_TEMPLATES,
@@ -1588,3 +1589,27 @@ export function loadNewsletterIssuesFromDisk() {
       state.newsletterIssues = []
     })
 }
+
+// ── Nuggets Episode Tags ─────────────────────────────────────────────────────
+
+export function queueNuggetsTagsWrite() {
+  state.nuggetsEpisodeTagsWritePromise = state.nuggetsEpisodeTagsWritePromise
+    .then(async () => {
+      await mkdir(DATA_DIR, { recursive: true })
+      await writeFile(NUGGETS_TAGS_FILE, JSON.stringify({ tags: state.nuggetsEpisodeTags }, null, 2), 'utf8')
+    })
+    .catch(err => {
+      console.error('[nuggets-tags] failed to write:', err)
+    })
+}
+
+export function loadNuggetsTagsFromDisk() {
+  return readFile(NUGGETS_TAGS_FILE, 'utf8')
+    .then(raw => {
+      const parsed = JSON.parse(raw)
+      state.nuggetsEpisodeTags = parsed?.tags && typeof parsed.tags === 'object' ? parsed.tags : {}
+    })
+    .catch(() => {
+      state.nuggetsEpisodeTags = {}
+    })
+}