feat: add GitHub setup step and enhance setup flow

- Introduced a new GitHubSetupStep component for GitHub CLI configuration during the setup process.
- Updated SetupView to include the GitHub step in the setup flow, allowing users to skip or proceed based on their GitHub CLI status.
- Enhanced state management to track GitHub CLI installation and authentication status.
- Added logging for transitions between setup steps to improve user feedback.
- Updated related files to ensure cross-platform path normalization and compatibility.

apps/server/src/routes/app-spec/generate-spec.ts

@@ -210,9 +210,9 @@ ${getAppSpecFormatInstruction()}`;
     logger.error("❌ WARNING: responseText is empty! Nothing to save.");
   }
 
-  // Save spec to external automaker directory
+  // Save spec to .automaker directory
   const specDir = await ensureAutomakerDir(projectPath);
-  const specPath = await getAppSpecPath(projectPath);
+  const specPath = getAppSpecPath(projectPath);
 
   logger.info("Saving spec to:", specPath);
   logger.info(`Content to save (${responseText.length} chars)`);