diff --git a/src/components/Header.jsx b/src/components/Header.jsx
index b7c5afe..900bc13 100644
--- a/src/components/Header.jsx
+++ b/src/components/Header.jsx
@@ -106,7 +106,7 @@ export const Header = () => {
         <div className="ml-auto flex items-center gap-1 sm:gap-3 shrink-0">
           
           {/* Real Live EKAP Mode Badge */}
-          <button
+          <button type="button"
             onClick={refreshLiveEKAPData}
             disabled={isRefreshingLive}
             className="bg-emerald-600 hover:bg-emerald-500 text-white font-extrabold px-3 py-1.5 rounded-lg text-xs hidden md:hidden md:flex items-center gap-1.5 shadow-xs transition-colors shrink-0 disabled:opacity-50"
@@ -117,7 +117,7 @@ export const Header = () => {
           </button>
 
           {/* AI Şartname Analizi */}
-          <button
+          <button type="button"
             onClick={() => setIsAiSpecAnalyzerOpen(true)}
             className="bg-purple-600 hover:bg-purple-500 text-white font-extrabold px-3 py-1.5 rounded-lg text-xs flex items-center gap-1.5 shadow-xs transition-colors shrink-0"
             title="Teknik şartnameyi AI ile analiz edin"
@@ -127,7 +127,7 @@ export const Header = () => {
           </button>
 
           {/* Company Web Scanner Button */}
-          <button
+          <button type="button"
             onClick={() => setIsCompanyScannerOpen(true)}
             className="bg-blue-600 hover:bg-blue-500 text-white font-bold px-3 py-1.5 rounded-lg text-xs hidden md:flex items-center gap-1.5 shadow-xs transition-colors shrink-0"
             title="Web Sitenizi Tarayın & AI İhale Profiline İşleyin"
@@ -144,7 +144,7 @@ export const Header = () => {
 
           {/* Notifications Dropdown */}
           <div className="relative">
-            <button
+            <button type="button"
               aria-label="Bildirimler"
               onClick={() => {setShowNotifications(!showNotifications);if(!showNotifications)void refreshNotifications();}}
               className="relative p-2 text-slate-300 hover:text-white hover:bg-slate-700 rounded-lg transition-colors"
@@ -159,9 +159,9 @@ export const Header = () => {
               <div className="absolute right-0 mt-2 w-80 bg-white text-slate-800 rounded-xl shadow-xl border border-slate-200 py-2 z-50 animate-fade-in">
                 <div className="px-4 py-2 border-b border-slate-100 flex items-center justify-between">
                   <h4 className="font-bold text-sm">Bildirimler</h4>
-                  <button disabled={notificationBusy || !notifications.some(n=>!n.read)} onClick={markNotificationsRead} className="text-xs text-blue-600 hover:underline disabled:opacity-50">Tümünü Okundu İşaretle</button>
+                  <button type="button" disabled={notificationBusy || !notifications.some(n=>!n.read)} onClick={markNotificationsRead} className="text-xs text-blue-600 hover:underline disabled:opacity-50">Tümünü Okundu İşaretle</button>
                 </div>
-                {notificationError&&<p role="alert" className="px-3 py-2 text-xs text-red-700">{notificationError} <button className="underline" onClick={refreshNotifications}>Bildirimleri yeniden yükle</button></p>}
+                {notificationError&&<p role="alert" className="px-3 py-2 text-xs text-red-700">{notificationError} <button type="button" className="underline" onClick={refreshNotifications}>Bildirimleri yeniden yükle</button></p>}
                 {notificationBusy&&<p role="status" className="px-3 text-xs">Okundu bilgisi kaydediliyor…</p>}
                 <div className="max-h-64 overflow-y-auto divide-y divide-slate-100">
                   {notifications.map(n => (
@@ -180,7 +180,7 @@ export const Header = () => {
 
           {/* User Profile */}
           <div className="relative">
-            <button
+            <button type="button"
               aria-label="Hesap menüsü"
               onClick={() => setShowUserMenu(!showUserMenu)}
               className="bg-slate-700 hover:bg-slate-600 text-white px-3 py-1.5 rounded-lg text-xs font-semibold flex items-center gap-2 transition-colors border border-slate-600"
@@ -206,13 +206,13 @@ export const Header = () => {
                   <p className="text-xs text-slate-500 truncate">{authUser?.email || userProfile.company}</p>
                 </div>
                 <div className="py-1 text-xs">
-                  <button
+                  <button type="button"
                     onClick={() => { setShowUserMenu(false); setActiveTab('list'); }}
                     className="w-full text-left px-4 py-2 hover:bg-slate-50 flex items-center gap-2 text-slate-700"
                   >
                     <User className="w-4 h-4 text-slate-400" /> Firma Bilgileri & Üyeler
                   </button>
-                  <button
+                  <button type="button"
                     onClick={() => { setShowUserMenu(false); setActiveTab('planlar'); }}
                     className="w-full text-left px-4 py-2 hover:bg-slate-50 flex items-center gap-2 text-slate-700"
                   >
@@ -222,7 +222,7 @@ export const Header = () => {
                       {planAdi}
                     </span>
                   </button>
-                  <button
+                  <button type="button"
                     onClick={() => { setShowUserMenu(false); setActiveTab('pwa_settings'); }}
                     className="w-full text-left px-4 py-2 hover:bg-slate-50 flex items-center gap-2 text-slate-700"
                   >
@@ -230,7 +230,7 @@ export const Header = () => {
                   </button>
                 </div>
                 <div className="border-t border-slate-100 pt-1 text-xs">
-                  <button
+                  <button type="button"
                     onClick={handleLogout}
                     className="w-full text-left px-4 py-2 text-red-600 hover:bg-red-50 flex items-center gap-2"
                   >