auto-claude: subtask-6-1 - TypeScript compilation check - fix GraphitiStep type error

Fixed TypeScript error in GraphitiStep.tsx where setDockerAvailable was
receiving `boolean | undefined` instead of the expected `boolean | null`.
Changed the ternary expression to explicitly return `true` or `false`.

All onboarding wizard components now compile without TypeScript errors.
Note: Pre-existing errors in terminal-name-generator.ts, Terminal.tsx,
useVirtualizedTree.test.ts, and browser-mock.ts are outside the scope
of this feature.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

auto-claude-ui/src/renderer/components/onboarding/GraphitiStep.tsx

@@ -61,7 +61,7 @@ export function GraphitiStep({ onNext, onBack, onSkip }: GraphitiStepProps) {
       try {
         // Check infrastructure status via the electronAPI
         const result = await window.electronAPI.getInfrastructureStatus();
-        setDockerAvailable(result?.success && result?.data?.docker?.running);
+        setDockerAvailable(result?.success && result?.data?.docker?.running ? true : false);
       } catch {
         // Infrastructure check may fail, assume unavailable
         setDockerAvailable(false);