fix: miscellaneous bug fixes (#1139)

* fix(share): serve place thumbnails in shared trip links (#1100)

Google-sourced place photos are stored as image_url pointing at the
JWT-guarded /api/maps/place-photo/:placeId/bytes endpoint, so they 401
for an unauthenticated shared-trip viewer and render as broken images.

Rewrite place image_url values in the shared payload to a public,
token-scoped proxy (/api/shared/:token/place-photo/:placeId/bytes) and
add an unguarded SharedController route that validates the token and that
the place belongs to its trip before streaming the cached bytes. Mirrors
the existing JourneyPublicController precedent. No client changes needed.

* fix(atlas): replace Natural Earth with geoBoundaries for up-to-date regions (#1119)

Atlas sourced country and sub-national boundaries from Natural Earth's GitHub
`master` at runtime. That data is stale (e.g. it still shows Norway's pre-2020
counties such as Oppland/Hordaland) and depicts some contested territory in
unwanted ways (nvkelso/natural-earth-vector#391), so Natural Earth is dropped
entirely.

- Country borders (admin0) now come from the geoBoundaries CGAZ composite;
  sub-national regions (admin1) from per-country gbOpen, which carries ISO 3166-2
  codes. A new script (server/scripts/build-atlas-geo.mjs) normalizes and quantizes
  them into committed gzipped bundles under server/assets/atlas, read server-side at
  runtime (no network at boot, no GitHub CSP allowlist entry).
- New GET /addons/atlas/countries/geo serves the country layer; the client fetches
  it from the API instead of GitHub.
- A migration reconciles manually-marked visited_regions against the new bundle
  (valid code -> keep; region name still matches -> re-code; curated merge crosswalk
  for renamed reforms; else leave intact), with UNIQUE-safe dedup. bucket_list and
  visited_countries hold only invariant alpha-2 country codes, so they are untouched.
- Attribution added (NOTICE.md + README) per geoBoundaries CC BY 4.0.

Closes #1119

* fix(packing): make templates admin-only to create, usable by members

Creating a packing-list template was gated only by trip access, so any
trip member could create one from the Lists feature, while applying a
template silently failed for non-admins because the apply dropdown was
populated from the AdminGuard-protected /api/admin/packing-templates
endpoint.

- save-as-template now returns 403 for non-admins; the Save-as-Template
  button is hidden unless the user is an admin (both the TripPlanner
  toolbar and the inline packing header).
- add member-accessible GET /api/trips/:tripId/packing/templates so the
  apply dropdown lists templates for any trip member; client fetches
  from it instead of the admin endpoint.

Closes #1120
Closes #1121

* fix(packing): show bag tracking to non-admin members

The global Bag Tracking toggle was only readable via the admin-gated
GET /api/admin/bag-tracking, so non-admin trip members got 403 and the
weight fields, bag circles, and BAGS sidebar never rendered (#1124).

Surface the flag through the already-authenticated GET /api/addons
(loaded into the client addon store on app start for every user); the
packing hook reads it from the store instead of the admin endpoint. The
admin write path stays admin-gated and unchanged.

client/tests/unit/stores/addonStore.test.ts

@@ -18,6 +18,18 @@ describe('addonStore', () => {
       expect(state.addons.length).toBeGreaterThan(0);
       expect(state.addons[0]).toHaveProperty('id');
       expect(state.addons[0]).toHaveProperty('enabled', true);
+      expect(state.bagTracking).toBe(false);
+    });
+
+    it('captures the global bagTracking flag from the response', async () => {
+      server.use(
+        http.get('/api/addons', () =>
+          HttpResponse.json({ bagTracking: true, addons: [] })
+        )
+      );
+
+      await useAddonStore.getState().loadAddons();
+      expect(useAddonStore.getState().bagTracking).toBe(true);
     });
   });