fix(settings): settings components and behavior consolidation

apps/sim/app/api/organizations/[id]/invitations/route.ts

@@ -244,16 +244,40 @@ export async function POST(request: NextRequest, { params }: { params: Promise<{
     const emailsToInvite = newEmails.filter((email: string) => !pendingEmails.includes(email))
 
     if (emailsToInvite.length === 0) {
+      const isSingleEmail = processedEmails.length === 1
+      const existingMembersEmails = processedEmails.filter((email: string) =>
+        existingEmails.includes(email)
+      )
+      const pendingInvitationEmails = processedEmails.filter((email: string) =>
+        pendingEmails.includes(email)
+      )
+
+      if (isSingleEmail) {
+        if (existingMembersEmails.length > 0) {
+          return NextResponse.json(
+            {
+              error: 'Failed to send invitation. User is already a part of the organization.',
+            },
+            { status: 400 }
+          )
+        }
+        if (pendingInvitationEmails.length > 0) {
+          return NextResponse.json(
+            {
+              error:
+                'Failed to send invitation. A pending invitation already exists for this email.',
+            },
+            { status: 400 }
+          )
+        }
+      }
+
       return NextResponse.json(
         {
-          error: 'All emails are already members or have pending invitations',
+          error: 'All emails are already members or have pending invitations.',
           details: {
-            existingMembers: processedEmails.filter((email: string) =>
-              existingEmails.includes(email)
-            ),
-            pendingInvitations: processedEmails.filter((email: string) =>
-              pendingEmails.includes(email)
-            ),
+            existingMembers: existingMembersEmails,
+            pendingInvitations: pendingInvitationEmails,
           },
         },
         { status: 400 }

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/account/account.tsx

@@ -232,7 +232,11 @@ export function Account(_props: AccountProps) {
           <div className='flex flex-1 flex-col justify-center'>
             <h3 className='font-medium text-base'>{profile?.name || ''}</h3>
             <p className='font-normal text-muted-foreground text-sm'>{profile?.email || ''}</p>
-            {uploadError && <p className='mt-1 text-destructive text-xs'>{uploadError}</p>}
+            {uploadError && (
+              <p className='mt-1 text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
+                {uploadError}
+              </p>
+            )}
           </div>
         </div>
 

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/api-keys/api-keys.tsx

@@ -512,9 +512,9 @@ export function ApiKeys({ onOpenChange, registerCloseHandler }: ApiKeysProps) {
                 autoFocus
               />
               {createError && (
-                <div className='text-[#DC2626] text-[12px] leading-tight dark:text-[#F87171]'>
+                <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
                   {createError}
-                </div>
+                </p>
               )}
             </div>
           </div>

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/creator-profile/creator-profile.tsx

@@ -291,7 +291,11 @@ export function CreatorProfile() {
                           />
                         </div>
                         <div className='flex flex-col gap-1'>
-                          {uploadError && <p className='text-destructive text-sm'>{uploadError}</p>}
+                          {uploadError && (
+                            <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
+                              {uploadError}
+                            </p>
+                          )}
                           <p className='text-muted-foreground text-xs'>PNG or JPEG (max 5MB)</p>
                         </div>
                       </div>
@@ -411,9 +415,9 @@ export function CreatorProfile() {
           {/* Error Message */}
           {saveError && (
             <div className='px-6 pb-2'>
-              <div className='text-[#DC2626] text-[12px] leading-tight dark:text-[#F87171]'>
+              <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
                 {saveError}
-              </div>
+              </p>
             </div>
           )}
 

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/custom-tools/custom-tools.tsx

@@ -1,7 +1,7 @@
 'use client'
 
 import { useState } from 'react'
-import { AlertCircle, Plus, Search } from 'lucide-react'
+import { Plus, Search } from 'lucide-react'
 import { useParams } from 'next/navigation'
 import {
   Button,
@@ -13,7 +13,7 @@ import {
   ModalHeader,
   ModalTitle,
 } from '@/components/emcn'
-import { Alert, AlertDescription, Input, Skeleton } from '@/components/ui'
+import { Input, Skeleton } from '@/components/ui'
 import { createLogger } from '@/lib/logs/console/logger'
 import { CustomToolModal } from '@/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/tool-input/components/custom-tool-modal/custom-tool-modal'
 import { useCustomTools, useDeleteCustomTool } from '@/hooks/queries/custom-tools'
@@ -84,7 +84,6 @@ export function CustomTools() {
     setShowDeleteDialog(false)
 
     try {
-      // Pass null workspaceId for user-scoped tools (legacy tools without workspaceId)
       await deleteToolMutation.mutateAsync({
         workspaceId: tool.workspaceId ?? null,
         toolId: toolToDelete.id,
@@ -105,24 +104,13 @@ export function CustomTools() {
   const handleToolSaved = () => {
     setShowAddForm(false)
     setEditingTool(null)
-    // React Query will automatically refetch via cache invalidation
     refetchTools()
   }
 
   return (
     <div className='relative flex h-full flex-col'>
       {/* Fixed Header with Search */}
       <div className='px-6 pt-4 pb-2'>
-        {/* Error Alert - only show when modal is not open */}
-        {error && !showAddForm && !editingTool && (
-          <Alert variant='destructive' className='mb-4'>
-            <AlertCircle className='h-4 w-4' />
-            <AlertDescription>
-              {error instanceof Error ? error.message : 'An error occurred'}
-            </AlertDescription>
-          </Alert>
-        )}
-
         {/* Search Input */}
         {isLoading ? (
           <Skeleton className='h-9 w-56 rounded-[8px]' />
@@ -148,6 +136,12 @@ export function CustomTools() {
               <CustomToolSkeleton />
               <CustomToolSkeleton />
             </div>
+          ) : error ? (
+            <div className='flex h-full flex-col items-center justify-center gap-2'>
+              <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
+                {error instanceof Error ? error.message : 'Failed to load tools'}
+              </p>
+            </div>
           ) : tools.length === 0 && !showAddForm && !editingTool ? (
             <div className='flex h-full items-center justify-center text-muted-foreground text-sm'>
               Click "Create Tool" below to get started

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/files/files.tsx

@@ -273,9 +273,9 @@ export function Files() {
       {/* Error message */}
       {uploadError && (
         <div className='px-6 pb-2'>
-          <div className='text-[#DC2626] text-[12px] leading-tight dark:text-[#F87171]'>
+          <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
             {uploadError}
-          </div>
+          </p>
         </div>
       )}
 

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/mcp/components/add-server-form.tsx

@@ -253,9 +253,9 @@ export function AddServerForm({
           <div className='space-y-1.5'>
             {/* Error message above buttons */}
             {testResult && !testResult.success && (
-              <div className='text-[#DC2626] text-[12px] leading-tight dark:text-[#F87171]'>
+              <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
                 {testResult.error || testResult.message}
-              </div>
+              </p>
             )}
 
             {/* Buttons row */}

apps/sim/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/mcp/mcp.tsx

@@ -1,10 +1,10 @@
 'use client'
 
 import { useCallback, useRef, useState } from 'react'
-import { AlertCircle, Plus, Search } from 'lucide-react'
+import { Plus, Search } from 'lucide-react'
 import { useParams } from 'next/navigation'
 import { Button } from '@/components/emcn'
-import { Alert, AlertDescription, Input, Skeleton } from '@/components/ui'
+import { Input, Skeleton } from '@/components/ui'
 import { createLogger } from '@/lib/logs/console/logger'
 import { createMcpToolId } from '@/lib/mcp/utils'
 import { checkEnvVarTrigger } from '@/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/env-var-dropdown'
@@ -24,7 +24,6 @@ export function MCP() {
   const params = useParams()
   const workspaceId = params.workspaceId as string
 
-  // React Query hooks
   const {
     data: servers = [],
     isLoading: serversLoading,
@@ -42,7 +41,7 @@ export function MCP() {
     transport: 'streamable-http',
     url: '',
     timeout: 30000,
-    headers: {}, // Start with no headers
+    headers: {},
   })
 
   const [showEnvVars, setShowEnvVars] = useState(false)
@@ -207,7 +206,6 @@ export function MCP() {
 
       try {
         await deleteServerMutation.mutateAsync({ workspaceId, serverId })
-        // TanStack Query mutations automatically invalidate and refetch tools
 
         logger.info(`Removed MCP server: ${serverId}`)
       } catch (error) {
@@ -264,27 +262,23 @@ export function MCP() {
             />
           </div>
         )}
-
-        {/* Error Alert */}
-        {(toolsError || serversError) && (
-          <Alert variant='destructive' className='mt-4'>
-            <AlertCircle className='h-4 w-4' />
-            <AlertDescription>
-              {toolsError instanceof Error
-                ? toolsError.message
-                : serversError instanceof Error
-                  ? serversError.message
-                  : 'An error occurred'}
-            </AlertDescription>
-          </Alert>
-        )}
       </div>
 
       {/* Scrollable Content */}
       <div className='min-h-0 flex-1 overflow-y-auto px-6'>
         <div className='space-y-2 pt-2 pb-6'>
           {/* Server List */}
-          {serversLoading ? (
+          {toolsError || serversError ? (
+            <div className='flex h-full flex-col items-center justify-center gap-2'>
+              <p className='text-[#DC2626] text-[11px] leading-tight dark:text-[#F87171]'>
+                {toolsError instanceof Error
+                  ? toolsError.message
+                  : serversError instanceof Error
+                    ? serversError.message
+                    : 'Failed to load MCP servers'}
+              </p>
+            </div>
+          ) : serversLoading ? (
             <div className='space-y-2'>
               <McpServerSkeleton />
               <McpServerSkeleton />
@@ -342,7 +336,6 @@ export function MCP() {
           ) : (
             <div className='space-y-2'>
               {filteredServers.map((server: any) => {
-                // Add defensive checks for server properties
                 if (!server || !server.id) {
                   return null
                 }