fix: Show only git SHA in header, remove version number

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cannaiq/src/components/Layout.tsx

@@ -131,7 +131,7 @@ export function Layout({ children }: LayoutProps) {
             <span className="text-lg font-bold text-gray-900">CannaIQ</span>
             {versionInfo && (
               <p className="text-xs text-gray-400">
-                v{versionInfo.version} ({versionInfo.git_sha}) {versionInfo.build_time !== 'unknown' && `- ${new Date(versionInfo.build_time).toLocaleDateString()}`}
+                {versionInfo.git_sha || 'dev'}
               </p>
             )}
           </div>