feat: add form validation for ekonomi module admin pages

- Added isFormValid() and isHtmlEmpty() helper functions
- Disabled submit buttons when required fields are empty
- Applied consistent validation pattern across all create/edit pages
- Validated fields: nama, deskripsi, tahun, jumlah, value, icon, statistik, and more
- Edit pages allow existing data, create pages require all fields

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

src/app/admin/(dashboard)/ekonomi/jumlah-penduduk-miskin/[id]/page.tsx

@@ -37,6 +37,16 @@ function EditJumlahPendudukMiskin() {
     totalPoorPopulation: 0,
   });
 
+  // Check if form is valid
+  const isFormValid = () => {
+    return (
+      formData.year !== null &&
+      formData.year > 0 &&
+      formData.totalPoorPopulation !== null &&
+      formData.totalPoorPopulation >= 0
+    );
+  };
+
   // 🔹 Load data awal dari backend
   useEffect(() => {
     if (!id) return;
@@ -160,8 +170,11 @@ function EditJumlahPendudukMiskin() {
               onClick={handleSubmit}
               radius="md"
               size="md"
+              disabled={!isFormValid() || isSubmitting}
               style={{
-                background: `linear-gradient(135deg, ${colors['blue-button']}, #4facfe)`,
+                background: !isFormValid() || isSubmitting
+                  ? `linear-gradient(135deg, #cccccc, #eeeeee)`
+                  : `linear-gradient(135deg, ${colors['blue-button']}, #4facfe)`,
                 color: '#fff',
                 boxShadow: '0 4px 15px rgba(79, 172, 254, 0.4)',
               }}