Gantt fix and admin user migration order

Author: chpy04

src/backend/src/prisma/migrations/20250626021534_finance_redesign/migration.sql

@@ -10,8 +10,11 @@ ALTER TABLE "Reimbursement_Product_Reason" ADD COLUMN "otherReasonId" TEXT;
 -- AlterTable
 ALTER TABLE "Reimbursement_Request" ADD COLUMN "indexCodeId" TEXT;
 
+-- CreateAdminUser
+INSERT INTO "User" ("userId", "firstName", "lastName", "googleAuthId", "email") VALUES ('0', 'Admin', 'User', 'admin', 'admin@gmail.com');
+
 -- AlterTable
-ALTER TABLE "Vendor" ADD COLUMN     "addedByUserId" TEXT NOT NULL,
+ALTER TABLE "Vendor" ADD COLUMN     "addedByUserId" TEXT NOT NULL DEFAULT '0',
 ADD COLUMN     "discountCode" TEXT,
 ADD COLUMN     "notes" TEXT,
 ADD COLUMN     "password" TEXT,
@@ -117,9 +120,6 @@ CREATE TABLE "_Account_CodeToReimbursement_Product_Other_Reason" (
     CONSTRAINT "_Account_CodeToReimbursement_Product_Other_Reason_AB_pkey" PRIMARY KEY ("A","B")
 );
 
--- CreateAdminUser
-INSERT INTO "User" ("userId", "firstName", "lastName", "googleAuthId", "email") VALUES ('0', 'Admin', 'User', 'admin', 'admin@gmail.com');
-
 -- Ensure every organization gets its own CASH and BUDGET index codes
 WITH orgs AS (
     SELECT "organizationId" FROM "Organization"

src/frontend/src/pages/GanttPage/GanttChart/GanttChartComponents/GanttTaskBar/GanttTaskBarDisplay.tsx

@@ -75,7 +75,7 @@ const GanttTaskBarDisplay = <T,>({
     cursor: 'pointer',
     position: 'sticky',
     left: 0,
-    width: hasChildren ? 'fit-content' : '100%'
+    width: hasOverlays ? 'fit-content' : '100%'
   };
 
   const ganttTaskBarChildOverlayStyles = (child: GanttTask<T>): CSSProperties => {
@@ -174,7 +174,7 @@ const GanttTaskBarDisplay = <T,>({
                 onMouseLeave={handleOnMouseLeave}
                 onClick={task.onClick}
               >
-                {hasChildren && (
+                {hasOverlays && (
                   <IconButton
                     onClick={(e) => {
                       e.stopPropagation();
@@ -193,7 +193,7 @@ const GanttTaskBarDisplay = <T,>({
                   {task.name}
                 </Typography>
               </div>
-              {hasChildren &&
+              {hasOverlays &&
                 task.children.map((childTask) => {
                   return (
                     <div