docs: add Cantaloupe Sync Admin UI section

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@@ -53,6 +53,17 @@ Hermes cron job `5ababff9c6e9` runs every 6 hours, executing `~/.hermes/scripts/
 **Credentials:** `~/.cantaloupe.env` — needs real mycantaloupe.com account (currently dummy, see issue #7).
 **Fix (e9d18cb):** Export subprocess cwd corrected to `~/projects/cantaloupe-downloader/`.
 
+### Cantaloupe Sync Admin UI (since 070e8c2)
+
+A new "Cantaloupe Sync" page in the admin SPA at `static/index.html` provides a UI for the sync workflow:
+
+- **Sync Overview** — Latest batch status badge (pending/approved/rejected/error), diff summary counts (New/Changed/Removed), last sync time, and "Sync Now" button
+- **Pending Batch Review** — Approve/reject buttons with full diff tables showing Machine ID, Name, Field, Old Value → New Value
+- **Import History** — Expandable rows with status badges, timestamps, and lazy-loaded diff detail
+- Dark theme matching existing admin UI, vanilla JS with fetch(), loading/error states
+
+**Fix (20002f4):** Updated login password hint from "Brett85!@" to "changeme".
+
 ## Related
 
 - Main app repo: [[https://gitea.ourpad.casa/shawn/canteen-asset-tracker|shawn/canteen-asset-tracker]]