fix: removed button margin, so they all have the same size

src/components/CalibrationListModal.tsx

@@ -184,7 +184,7 @@ export default function CalibrationListModal({ experimentId }: CalibrationListMo
     <>
       <button
         onClick={() => setIsOpen(true)}
-        className="mb-6 px-4 py-2 bg-blue-500 text-white rounded-md hover:bg-blue-600 transition-colors"
+        className="px-4 py-2 bg-blue-500 text-white rounded-md hover:bg-blue-600 transition-colors"
       >
         📋 View Calibration List
       </button>

src/components/UpdateDatasetMetadataModal.tsx

@@ -219,7 +219,7 @@ export default function UpdateDatasetMetadataModal({
     <>
       <button
         onClick={() => setIsOpen(true)}
-        className="mb-6 px-4 py-2 bg-blue-500 text-white rounded-md hover:bg-blue-600 transition-colors"
+        className="px-4 py-2 bg-blue-500 text-white rounded-md hover:bg-blue-600 transition-colors"
       >
         ⟳ Update Metadata
       </button>

src/components/UploadCalibrationModal.tsx

@@ -219,7 +219,7 @@ export default function UploadCalibrationModal({
     <>
       <button
         onClick={() => setIsOpen(true)}
-        className="mb-6 px-4 py-2 bg-purple-500 text-white rounded-md hover:bg-purple-600 transition-colors"
+        className="px-4 py-2 bg-purple-500 text-white rounded-md hover:bg-purple-600 transition-colors"
       >
         + Upload Calibration
       </button>

src/components/UploadDatasetEntriesModal.tsx

@@ -219,7 +219,7 @@ export default function UploadDatasetEntriesModal({
     <>
       <button
         onClick={() => setIsOpen(true)}
-        className="mb-6 px-4 py-2 bg-green-500 text-white rounded-md hover:bg-green-600 transition-colors"
+        className="px-4 py-2 bg-green-500 text-white rounded-md hover:bg-green-600 transition-colors"
       >
         + Upload Entries
       </button>