fix: address code review feedback

- Add validation for categories and experienceLevel in GET endpoint
- Fix type safety: remove 'any' types, use proper Platform type
- Fix hardcoded translations in Header component
- Refactor platform loading to use centralized platform list
- Remove duplicate getPackageManagerForOS logic
- Improve architectural consistency and DRY principles

Resolves Gemini Code Assist review comments

src/app/api/recommendations/route.ts

@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
 import { RecommendationService } from "@/services/recommendationService";
-import { RecommendationRequest } from "@/types/recommendations";
+import { RecommendationRequest, UserCategory, ExperienceLevel } from "@/types/recommendations";
 
 export async function POST(request: NextRequest) {
   try {
@@ -151,18 +151,52 @@ export async function GET(request: NextRequest) {
       );
     }
 
+    // Validate categories
+    const validCategories: UserCategory[] = [
+      "development",
+      "design",
+      "multimedia",
+      "system-tools",
+      "gaming",
+      "productivity",
+      "education",
+    ];
+    const invalidCategories = categories.filter(
+      (cat) => !validCategories.includes(cat as UserCategory)
+    );
+    if (invalidCategories.length > 0) {
+      return NextResponse.json(
+        {
+          error: `Invalid categories: ${invalidCategories.join(", ")}`,
+          validCategories,
+        },
+        { status: 400 }
+      );
+    }
+
+    // Validate experience level if provided
+    const validExperienceLevels: ExperienceLevel[] = ["beginner", "intermediate", "advanced"];
+    if (experienceLevel && !validExperienceLevels.includes(experienceLevel as ExperienceLevel)) {
+      return NextResponse.json(
+        {
+          error: `Invalid experience_level. Must be one of: ${validExperienceLevels.join(", ")}`,
+        },
+        { status: 400 }
+      );
+    }
+
     // Set default limit
     const parsedLimit =
       limit && parseInt(limit) > 0 && parseInt(limit) <= 50
         ? parseInt(limit)
         : 20;
 
-    // Generate recommendations
+    // Generate recommendations with validated types
     const recommendations = await RecommendationService.generateRecommendations(
       {
         platform_id: platformId,
-        categories: categories as any,
-        experienceLevel: experienceLevel as any,
+        categories: categories as UserCategory[],
+        experienceLevel: experienceLevel as ExperienceLevel | undefined,
         limit: parsedLimit,
       }
     );

src/components/Header.tsx

@@ -70,7 +70,7 @@ export function Header({ cryptomusEnabled, onResetPreferences, hasProfile }: Hea
               >
                 <Settings className="h-4 w-4" />
                 <span className="ml-2 hidden sm:inline">
-                  {locale === 'tr' ? 'Tercihler' : 'Preferences'}
+                  {t('recommendations.customize')}
                 </span>
               </Button>
             )}

src/components/RepoHubApp.tsx

@@ -20,6 +20,7 @@ function RepoHubAppContent({ cryptomusEnabled }: { cryptomusEnabled: boolean })
   const [selectedPlatform, setSelectedPlatform] = useState<Platform | null>(null)
   const [selectedPackages, setSelectedPackages] = useState<SelectedPackage[]>([])
   const [generatedScript, setGeneratedScript] = useState<GeneratedScript | null>(null)
+  const [availablePlatforms, setAvailablePlatforms] = useState<Platform[]>([])
 
   // Recommendation profile management
   const {
@@ -32,6 +33,22 @@ function RepoHubAppContent({ cryptomusEnabled }: { cryptomusEnabled: boolean })
 
   const [showOnboarding, setShowOnboarding] = useState(false)
 
+  // Load platforms on mount
+  useEffect(() => {
+    const loadPlatforms = async () => {
+      try {
+        const response = await fetch('/api/platforms')
+        if (response.ok) {
+          const platforms = await response.json()
+          setAvailablePlatforms(platforms)
+        }
+      } catch (error) {
+        console.error('Failed to load platforms:', error)
+      }
+    }
+    loadPlatforms()
+  }, [])
+
   // Show onboarding modal on first visit
   useEffect(() => {
     if (!isProfileLoading && !hasCompletedOnboarding) {
@@ -97,64 +114,29 @@ function RepoHubAppContent({ cryptomusEnabled }: { cryptomusEnabled: boolean })
   }
 
   const handleGenerateScript = () => {
-    console.log('🔧 handleGenerateScript called')
-    console.log('📦 selectedPackages:', selectedPackages)
-    console.log('🖥️ selectedPlatform:', selectedPlatform)
-    console.log('✅ hasCompletedOnboarding:', hasCompletedOnboarding)
-
     if (selectedPackages.length === 0) {
-      console.log('❌ No packages selected')
       return
     }
 
-    // Use selected platform, or if not selected, use the platform from recommendations profile
+    // Use selected platform, or if not selected, find platform from available platforms
     let platformToUse = selectedPlatform
 
     if (!platformToUse && hasCompletedOnboarding) {
-      // Get effective OS from profile and find matching platform
+      // Get effective OS from profile and find matching platform from loaded platforms
       const effectiveOS = profile.selectedOS || detectedOS
-      console.log('🔍 effectiveOS:', effectiveOS)
       
-      // We need to fetch the platform data - for now, create a mock platform
-      // This should ideally come from the platforms list
-      if (effectiveOS) {
-        platformToUse = {
-          id: effectiveOS,
-          name: effectiveOS.charAt(0).toUpperCase() + effectiveOS.slice(1),
-          description: '',
-          icon: '',
-          packageManager: getPackageManagerForOS(effectiveOS)
+      if (effectiveOS && availablePlatforms.length > 0) {
+        platformToUse = availablePlatforms.find(p => p.id === effectiveOS) || null
+        
+        if (!platformToUse) {
+          console.warn(`Platform not found for OS: ${effectiveOS}`)
         }
-        console.log('🎯 Created platform:', platformToUse)
       }
     }
 
     if (platformToUse) {
-      console.log('✨ Generating script for platform:', platformToUse)
       const script = generateScript(selectedPackages, platformToUse)
-      console.log('📝 Script generated:', script)
       setGeneratedScript(script)
-    } else {
-      console.log('❌ No platform available')
-    }
-  }
-
-  // Helper function to get package manager for OS
-  const getPackageManagerForOS = (os: string): string => {
-    switch (os.toLowerCase()) {
-      case 'windows':
-        return 'winget'
-      case 'macos':
-        return 'brew'
-      case 'ubuntu':
-      case 'debian':
-        return 'apt'
-      case 'fedora':
-        return 'dnf'
-      case 'arch':
-        return 'pacman'
-      default:
-        return 'unknown'
     }
   }
 
@@ -228,13 +210,16 @@ function RepoHubAppContent({ cryptomusEnabled }: { cryptomusEnabled: boolean })
           <ScriptPreview
             generatedScript={generatedScript}
             selectedPackages={selectedPackages}
-            selectedPlatform={selectedPlatform || {
+            selectedPlatform={selectedPlatform || 
+              availablePlatforms.find(p => p.id === generatedScript.platform) || 
+              {
                 id: generatedScript.platform,
                 name: generatedScript.platform.charAt(0).toUpperCase() + generatedScript.platform.slice(1),
                 description: '',
                 icon: '',
-              packageManager: getPackageManagerForOS(generatedScript.platform)
-            }}
+                packageManager: ''
+              }
+            }
             onClose={handleCloseScriptPreview}
           />
         )}

src/types/recommendations.ts

@@ -52,7 +52,7 @@ export interface RecommendedPackage {
   category?: string;
   license?: string;
   type: "gui" | "cli";
-  platform?: string | any;
+  platform?: Platform;
   platform_id?: string;
   repository: "official" | "third-party" | "aur";
   download_url?: string;