fix: update tests for demo reorganisation (italy-2026-demo, central-asia ordering, japan real entry)

- dailies T2: switch ordering test to central-asia-2023 (pixelfed-1 oldest, pixelfed-22 newest)
- dailies T3-T6: update KNOWN_SLUG/TITLE/CITY/COUNTRY to the real japan entry (2026-06-17)
- stories S1-S7: update all italy-2025 URLs to italy-2026-demo
- stories S5/S6: fix URL regex and use val-dorcia-dawn for hero sanity check
- maps M5/M6: point Italy GPX map tests to italy-2026-demo (has markers + GPX)
- global-setup: run make demo-load before tests so italy-2026-demo always exists
- post P2: add retries:1 + test.setTimeout(60s) for intermittent FilePond upload
- user: story template hero fallback for media.types config override (see user commit)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

tests/global-setup.js

@@ -1,5 +1,6 @@
 const fs = require('fs');
 const path = require('path');
+const { execSync } = require('child_process');
 
 module.exports = async function globalSetup() {
     const envFile = path.join(__dirname, '../.env');
@@ -11,4 +12,7 @@ module.exports = async function globalSetup() {
             }
         });
     }
+
+    // Ensure demo content is loaded (italy-2026-demo trip + stories + GPX files)
+    execSync('make demo-load', { cwd: path.join(__dirname, '..'), stdio: 'inherit' });
 };