test: reorganise tests/ui/ into feature subdirectories

tests/ui/home/home-highlights.spec.js

@@ -7,7 +7,7 @@ const { test, expect } = require('@playwright/test');
 const fs = require('fs');
 const path = require('path');
 
-const SITE_YAML_PATH = path.join(__dirname, '../../user/config/site.yaml');
+const SITE_YAML_PATH = path.join(__dirname, '../../../user/config/site.yaml');
 
 test.describe('Between-trips highlights mode', () => {
     let originalSiteYaml;

tests/ui/post/post.spec.js

@@ -4,7 +4,7 @@
 const { test, expect } = require('@playwright/test');
 const path = require('path');
 const fs = require('fs');
-const { waitForFilePondUpload, cleanupEntry, findEntry, readEntryMd, TRACKER_DIR } = require('./helpers');
+const { waitForFilePondUpload, cleanupEntry, findEntry, readEntryMd, TRACKER_DIR } = require('../helpers');
 
 const TEST_PHOTO = path.join(__dirname, '../fixtures/test-photo.jpg');