Fix API connectivity and import filament data from PDF

- Update all environment files to use new PostgreSQL API endpoint
- Fix CORS configuration in API server
- Import 35 filaments and 29 colors from PDF data
- Fix TypeScript type error in dashboard
- Add back emoji icons for dark mode toggle
- Remove debugging code and test buttons
- Clean up error handling

app/page.tsx

@@ -42,9 +42,19 @@ export default function Home() {
       
       const filaments = await filamentService.getAll();
       setFilaments(filaments);
-    } catch (err) {
+    } catch (err: any) {
       console.error('API Error:', err);
-      setError(err instanceof Error ? err.message : 'Greška pri učitavanju filamenata');
+      
+      // More descriptive error messages
+      if (err.code === 'ERR_NETWORK') {
+        setError('Network Error - Unable to connect to API');
+      } else if (err.response) {
+        setError(`Server error: ${err.response.status} - ${err.response.statusText}`);
+      } else if (err.request) {
+        setError('No response from server - check if API is running');
+      } else {
+        setError(err.message || 'Greška pri učitavanju filamenata');
+      }
     } finally {
       setLoading(false);
     }
@@ -91,7 +101,7 @@ export default function Home() {
                   className="p-2 bg-white/50 dark:bg-gray-700/50 backdrop-blur text-gray-800 dark:text-gray-200 rounded-full hover:bg-white/80 dark:hover:bg-gray-600/80 transition-all duration-200 hover:scale-110 shadow-md ml-2"
                   title={darkMode ? 'Svetla tema' : 'Tamna tema'}
                 >
-                  {darkMode ? 'Svetla' : 'Tamna'}
+                  {darkMode ? '☀️' : '🌙'}
                 </button>
               )}
             </div>