fix: align button icons and polish vendor sidebar

Fix vertical alignment of Lucide icons inside Button children across
all pages by adding verticalAlign offsets (-3px for 16px icons, -2px
for 14px icons). The design system Button wraps children in an inline
span, so SVG icons defaulted to baseline alignment.

Hide the redundant top-right "Create Tenant" button on VendorTenantsPage
when no tenants exist — the EmptyState already provides that action.

Add icons to all vendor sidebar sub-items for consistency (previously
only Email Connector had one).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/tenant/SsoPage.tsx

@@ -185,7 +185,7 @@ export function SsoPage() {
       <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
         <h1 style={{ margin: 0, fontSize: '1.25rem', fontWeight: 600 }}>Enterprise SSO</h1>
         <Button variant="primary" onClick={() => setShowCreate((v) => !v)}>
-          <Plus size={16} style={{ marginRight: 6 }} />
+          <Plus size={16} style={{ marginRight: 6, verticalAlign: -3 }} />
           Add SSO Connection
         </Button>
       </div>
@@ -284,7 +284,7 @@ export function SsoPage() {
           description="Add an enterprise SSO connection to let your team sign in with their corporate identity provider."
           action={
             <Button variant="primary" onClick={() => setShowCreate(true)}>
-              <Plus size={16} style={{ marginRight: 6 }} />
+              <Plus size={16} style={{ marginRight: 6, verticalAlign: -3 }} />
               Add SSO Connection
             </Button>
           }
@@ -413,7 +413,7 @@ function CaCertificatesSection() {
                 <FileInput ref={certRef} accept=".pem,.crt,.cer" icon={<ShieldCheck size={16} />} />
               </FormField>
               <Button variant="primary" onClick={handleUpload} loading={stageMutation.isPending}>
-                <Upload size={14} style={{ marginRight: 6 }} />
+                <Upload size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                 Stage Certificate
               </Button>
             </div>
@@ -447,7 +447,7 @@ function CaCertificatesSection() {
                 </div>
                 <div style={{ paddingTop: 8, display: 'flex', gap: 8 }}>
                   <Button variant="primary" onClick={() => handleActivate(cert.id)} loading={activateMutation.isPending}>
-                    <ShieldCheck size={14} style={{ marginRight: 6 }} />
+                    <ShieldCheck size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                     Activate
                   </Button>
                   <Button variant="danger" onClick={() => setDeleteTarget(cert)}>
@@ -486,7 +486,7 @@ function CaCertificatesSection() {
                 </div>
                 <div style={{ paddingTop: 8 }}>
                   <Button variant="danger" onClick={() => setDeleteTarget(cert)}>
-                    <Trash2 size={14} style={{ marginRight: 6 }} />
+                    <Trash2 size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                     Remove
                   </Button>
                 </div>

ui/src/pages/tenant/TeamPage.tsx

@@ -161,7 +161,7 @@ export function TeamPage() {
       <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
         <h1 style={{ margin: 0, fontSize: '1.25rem', fontWeight: 600 }}>Team</h1>
         <Button variant="primary" onClick={() => setShowInvite((v) => !v)}>
-          <Plus size={16} style={{ marginRight: 6 }} />
+          <Plus size={16} style={{ marginRight: 6, verticalAlign: -3 }} />
           Invite Member
         </Button>
       </div>
@@ -222,7 +222,7 @@ export function TeamPage() {
           description="Invite colleagues to collaborate on this tenant."
           action={
             <Button variant="primary" onClick={() => setShowInvite(true)}>
-              <Plus size={16} style={{ marginRight: 6 }} />
+              <Plus size={16} style={{ marginRight: 6, verticalAlign: -3 }} />
               Invite Member
             </Button>
           }

ui/src/pages/tenant/TenantDashboardPage.tsx

@@ -112,7 +112,7 @@ export function TenantDashboardPage() {
                 }}
                 loading={restartServer.isPending}
               >
-                <RefreshCw size={14} style={{ marginRight: 6 }} />
+                <RefreshCw size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                 Restart
               </Button>
               <Button
@@ -127,7 +127,7 @@ export function TenantDashboardPage() {
                 }}
                 loading={upgradeServer.isPending}
               >
-                <ArrowUpCircle size={14} style={{ marginRight: 6 }} />
+                <ArrowUpCircle size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                 Upgrade
               </Button>
             </div>
@@ -150,16 +150,16 @@ export function TenantDashboardPage() {
                 variant="secondary"
                 onClick={() => window.open(`/t/${data.slug}/`, '_blank')}
               >
-                <ExternalLink size={14} style={{ marginRight: 6 }} />
+                <ExternalLink size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                 Open Server Dashboard
               </Button>
             )}
             <Button variant="secondary" onClick={() => navigate('../license')}>
-              <Key size={14} style={{ marginRight: 6 }} />
+              <Key size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               View License
             </Button>
             <Button variant="secondary" onClick={() => navigate('../oidc')}>
-              <Settings size={14} style={{ marginRight: 6 }} />
+              <Settings size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               Configure OIDC
             </Button>
           </div>

ui/src/pages/tenant/TenantLicensePage.tsx

@@ -132,12 +132,12 @@ export function TenantLicensePage() {
           <div style={{ display: 'flex', gap: 8 }}>
             <Button variant="secondary" onClick={() => setShowToken((v) => !v)}>
               {showToken
-                ? <><EyeOff size={14} style={{ marginRight: 6 }} />Hide</>
-                : <><Eye size={14} style={{ marginRight: 6 }} />Show</>
+                ? <><EyeOff size={14} style={{ marginRight: 6, verticalAlign: -2 }} />Hide</>
+                : <><Eye size={14} style={{ marginRight: 6, verticalAlign: -2 }} />Show</>
               }
             </Button>
             <Button variant="secondary" onClick={handleCopy}>
-              <Copy size={14} style={{ marginRight: 6 }} />
+              <Copy size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               Copy
             </Button>
           </div>

ui/src/pages/vendor/CertificatesPage.tsx

@@ -225,7 +225,7 @@ export function CertificatesPage() {
                   onClick={handleActivate}
                   loading={activateMutation.isPending}
                 >
-                  <ShieldCheck size={14} style={{ marginRight: 6 }} />
+                  <ShieldCheck size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                   Activate
                 </Button>
                 <Button
@@ -233,7 +233,7 @@ export function CertificatesPage() {
                   onClick={handleDiscard}
                   loading={discardMutation.isPending}
                 >
-                  <Trash2 size={14} style={{ marginRight: 6 }} />
+                  <Trash2 size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                   Discard
                 </Button>
               </>
@@ -252,7 +252,7 @@ export function CertificatesPage() {
                 loading={restoreMutation.isPending}
                 disabled={expired}
               >
-                <RotateCcw size={14} style={{ marginRight: 6 }} />
+                <RotateCcw size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                 {expired ? 'Expired' : 'Restore'}
               </Button>
             }
@@ -284,7 +284,7 @@ export function CertificatesPage() {
               onClick={handleUpload}
               loading={stageMutation.isPending}
             >
-              <Upload size={14} style={{ marginRight: 6 }} />
+              <Upload size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               Stage Certificate
             </Button>
           </div>

ui/src/pages/vendor/EmailConfigPage.tsx

@@ -172,7 +172,7 @@ export function EmailConfigPage() {
                 </Button>
                 {!confirmDelete ? (
                   <Button variant="secondary" onClick={() => setConfirmDelete(true)}>
-                    <Trash2 size={14} style={{ marginRight: 6 }} />
+                    <Trash2 size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                     Remove
                   </Button>
                 ) : (
@@ -235,7 +235,7 @@ export function EmailConfigPage() {
               </FormField>
               <div style={{ display: 'flex', gap: 8 }}>
                 <Button variant="primary" onClick={handleSave} loading={saveMutation.isPending}>
-                  <Save size={14} style={{ marginRight: 6 }} />
+                  <Save size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                   {isConfigured ? 'Update' : 'Save'}
                 </Button>
                 {editing && (
@@ -263,7 +263,7 @@ export function EmailConfigPage() {
                   onClick={handleToggleRegistration}
                   loading={toggleMutation.isPending}
                 >
-                  <Power size={14} style={{ marginRight: 6 }} />
+                  <Power size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                   {connector.registrationEnabled ? 'Disable Registration' : 'Enable Registration'}
                 </Button>
               </div>
@@ -284,7 +284,7 @@ export function EmailConfigPage() {
                 />
               </FormField>
               <Button variant="primary" onClick={handleTest} loading={testMutation.isPending}>
-                <Send size={14} style={{ marginRight: 6 }} />
+                <Send size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                 Send Test Email
               </Button>
             </div>

ui/src/pages/vendor/TenantDetailPage.tsx

@@ -227,7 +227,7 @@ export function TenantDetailPage() {
                   onClick={handleRenewLicense}
                   loading={renewLicense.isPending}
                 >
-                  <RefreshCw size={14} style={{ marginRight: 6 }} />
+                  <RefreshCw size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
                   Renew License
                 </Button>
               </div>
@@ -276,7 +276,7 @@ export function TenantDetailPage() {
               onClick={handleRestart}
               loading={restartServer.isPending}
             >
-              <RefreshCw size={14} style={{ marginRight: 6 }} />
+              <RefreshCw size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               Restart Server
             </Button>
             <Button
@@ -284,7 +284,7 @@ export function TenantDetailPage() {
               onClick={handleUpgrade}
               loading={upgradeServer.isPending}
             >
-              <ArrowUpCircle size={14} style={{ marginRight: 6 }} />
+              <ArrowUpCircle size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               Upgrade Server
             </Button>
             <Button
@@ -298,7 +298,7 @@ export function TenantDetailPage() {
               variant="danger"
               onClick={() => setDeleteOpen(true)}
             >
-              <Trash2 size={14} style={{ marginRight: 6 }} />
+              <Trash2 size={14} style={{ marginRight: 6, verticalAlign: -2 }} />
               Delete Tenant
             </Button>
           </div>

ui/src/pages/vendor/VendorTenantsPage.tsx

@@ -93,13 +93,15 @@ export function VendorTenantsPage() {
     <div style={{ padding: '24px', display: 'flex', flexDirection: 'column', gap: 20 }}>
       <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
         <h1 style={{ margin: 0, fontSize: '1.25rem', fontWeight: 600 }}>Tenants</h1>
-        <Button
-          variant="primary"
-          onClick={() => navigate('/vendor/tenants/new')}
-        >
-          <Plus size={16} style={{ marginRight: 6 }} />
-          Create Tenant
-        </Button>
+        {!isLoading && tenants && tenants.length > 0 && (
+          <Button
+            variant="primary"
+            onClick={() => navigate('/vendor/tenants/new')}
+          >
+            <Plus size={16} style={{ marginRight: 6, verticalAlign: -3 }} />
+            Create Tenant
+          </Button>
+        )}
       </div>
 
       {isLoading && (
@@ -115,7 +117,7 @@ export function VendorTenantsPage() {
           description="Create your first tenant to get started."
           action={
             <Button variant="primary" onClick={() => navigate('/vendor/tenants/new')}>
-              <Plus size={16} style={{ marginRight: 6 }} />
+              <Plus size={16} style={{ marginRight: 6, verticalAlign: -3 }} />
               Create Tenant
             </Button>
           }