feat(admin/stops): add tabbed dashboard with calendar and locations views

Replace the table-only stops view with a three-tab 'Harvest Dispatch'
almanac dashboard.

- Calendar tab: month grid with stops as status-colored pins, day-detail
  side panel, prev/next/today nav, weekend tint, sunrise gradient on
  the current day.
- Locations tab: cards grouped by city+state with per-location stats
  (stops/active/upcoming), date range, next-stop ribbon, and inline
  expansion to list every stop at that location. Top of the tab shows
  a six-card almanac stats strip (Locations/Cities/Stops/Active/Upcoming/
  Drafts).
- List tab: condensed read-only list of all stops in date order.

Typography: load Fraunces (display), Manrope (body), and Fragment Mono
(mono) via next/font/google, wired into the Tailwind theme as
--font-display, --font-sans, --font-mono. Add typescript to devDeps
for tsc --noEmit in this environment.

Visual signature: cream parchment cards, forest green + clay accents,
Roman-numeral stat cells, paper-grain noise, binder-tab nav, route
number watermarks on location cards, harvest-pin SVG markers.

Verified with tsc --noEmit, eslint on the new files, and a 200 from
GET /admin/stops in the dev server.

src/app/globals.css

@@ -1,6 +1,11 @@
 @import "tailwindcss";
 
 @theme {
+  /* Custom typefaces — Field Almanac */
+  --font-display: var(--font-fraunces, "Georgia"), Georgia, serif;
+  --font-sans: var(--font-manrope, system-ui), system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
+  --font-mono: var(--font-fragment-mono, "JetBrains Mono"), ui-monospace, SFMono-Regular, Menlo, monospace;
+
   /* Apple-inspired dark palette — sophisticated depth */
   --color-surface-50: #f5f5f7;
   --color-surface-100: #e8e8ed;
@@ -85,7 +90,7 @@ html {
 }
 
 body {
-  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
+  font-family: var(--font-sans);
   background: #ffffff;
   background-attachment: fixed;
   color: #1a1a1a;