pco-plan: everything configured in Admin; key, section and top-bar restyle

- Drops the separate setup page: the service type is a select grouped by
  Planning Center folder path (GET /service-types), the pinned plan a
  select of upcoming/recent plans that follows the chosen service type
  (GET /plans?serviceTypeId=), credentials sit in a group that folds once
  saved.
- Show/hide moves from per-tile settings to a server-wide checklist in
  Admin (three columns, folded by default): top bar, series, part, service
  type, date, service time, total length, running clock, countdown,
  headers, item numbers, start times, length, type badge, key, arrangement,
  author/CCLI, description, notes, pre/post-service items, now indicator,
  item runtime, dim completed, ProPresenter line. Tiles keep only text
  size and auto-scroll.
- Top bar text is a template with placeholders ({series} • {part} |
  {serviceType} • {date} by default; • separates droppable segments, |
  starts the second line).
- Song key: larger, admin-chosen color (blue by default), always right
  after the title and before the type badge. Section headers are
  full-width accent bands. Optional background tint per item type.
- tools/pco-mock.js plan titles are part numbers, as in a real series.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tools/pco-mock.js

@@ -84,9 +84,9 @@ function plansFor(stId) {
     ],
   });
   return [
-    mk(`${stId}-P1`, firstServiceStart - 7 * DAY, 'The Table', 'Living Hope'),
-    mk(`${stId}-P2`, firstServiceStart, 'Living Hope Wk 2', 'Living Hope'),
-    mk(`${stId}-P3`, firstServiceStart + 7 * DAY, 'Living Hope Wk 3', 'Living Hope'),
+    mk(`${stId}-P1`, firstServiceStart - 7 * DAY, 'Part 1', 'Living Hope'),
+    mk(`${stId}-P2`, firstServiceStart, 'Part 2', 'Living Hope'),
+    mk(`${stId}-P3`, firstServiceStart + 7 * DAY, 'Part 3', 'Living Hope'),
   ];
 }