feat(changelog): switch from repo-based to commit-type category tabs

Replace repo-based tabs (Core, Deployment, Theme, etc.) with
commit-type tabs (Features, Fixes, Performance, Accessibility, Docs,
Other) to align with updated endpoint-github changelog categorization.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

changelog.njk

@@ -118,34 +118,29 @@ function changelogApp() {
 
     tabs: [
       { key: 'all', label: 'All' },
-      { key: 'core', label: 'Core' },
-      { key: 'deployment', label: 'Deployment' },
-      { key: 'theme', label: 'Theme' },
-      { key: 'endpoints', label: 'Endpoints' },
-      { key: 'syndicators', label: 'Syndicators' },
-      { key: 'post-types', label: 'Post Types' },
-      { key: 'presets', label: 'Presets' },
+      { key: 'features', label: 'Features' },
+      { key: 'fixes', label: 'Fixes' },
+      { key: 'performance', label: 'Performance' },
+      { key: 'accessibility', label: 'Accessibility' },
+      { key: 'documentation', label: 'Docs' },
+      { key: 'other', label: 'Other' },
     ],
 
     categoryLabels: {
-      core: 'Core',
-      deployment: 'Deployment',
-      theme: 'Theme',
-      endpoints: 'Endpoint',
-      syndicators: 'Syndicator',
-      'post-types': 'Post Type',
-      presets: 'Preset',
+      features: 'Features',
+      fixes: 'Fixes',
+      performance: 'Performance',
+      accessibility: 'Accessibility',
+      documentation: 'Docs',
       other: 'Other',
     },
 
     categoryColors: {
-      core: 'bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300',
-      deployment: 'bg-orange-100 dark:bg-orange-900 text-orange-700 dark:text-orange-300',
-      theme: 'bg-purple-100 dark:bg-purple-900 text-purple-700 dark:text-purple-300',
-      endpoints: 'bg-green-100 dark:bg-green-900 text-green-700 dark:text-green-300',
-      syndicators: 'bg-teal-100 dark:bg-teal-900 text-teal-700 dark:text-teal-300',
-      'post-types': 'bg-pink-100 dark:bg-pink-900 text-pink-700 dark:text-pink-300',
-      presets: 'bg-yellow-100 dark:bg-yellow-900 text-yellow-700 dark:text-yellow-300',
+      features: 'bg-green-100 dark:bg-green-900 text-green-700 dark:text-green-300',
+      fixes: 'bg-orange-100 dark:bg-orange-900 text-orange-700 dark:text-orange-300',
+      performance: 'bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300',
+      accessibility: 'bg-purple-100 dark:bg-purple-900 text-purple-700 dark:text-purple-300',
+      documentation: 'bg-yellow-100 dark:bg-yellow-900 text-yellow-700 dark:text-yellow-300',
       other: 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300',
     },