diff --git a/apps/web/src/app/(portal)/settings/layout.tsx b/apps/web/src/app/(portal)/settings/layout.tsx
index 37fd430..8eb4cc7 100644
--- a/apps/web/src/app/(portal)/settings/layout.tsx
+++ b/apps/web/src/app/(portal)/settings/layout.tsx
@@ -26,6 +26,7 @@ export default function SettingsLayout({
           className="mb-4 inline-flex items-center gap-1 text-sm text-muted-foreground transition-colors hover:text-foreground"
         >
           <svg
+            aria-hidden="true"
             xmlns="http://www.w3.org/2000/svg"
             width="16"
             height="16"
diff --git a/apps/web/src/components/layout/header.tsx b/apps/web/src/components/layout/header.tsx
index c33f8c9..8514c13 100644
--- a/apps/web/src/components/layout/header.tsx
+++ b/apps/web/src/components/layout/header.tsx
@@ -99,11 +99,13 @@ export function Header() {
       {/* Left: Logo + Mobile hamburger */}
       <div className="flex items-center gap-3">
         <button
+          type="button"
           onClick={() => setMobileOpen(true)}
           className="inline-flex items-center justify-center rounded-md p-2 text-muted-foreground hover:bg-muted hover:text-foreground transition-colors md:hidden"
           aria-label={t('common.menu')}
         >
           <svg
+            aria-hidden="true"
             xmlns="http://www.w3.org/2000/svg"
             width="20"
             height="20"
@@ -145,6 +147,7 @@ export function Header() {
         {/* User avatar dropdown */}
         <div className="relative" ref={dropdownRef}>
           <button
+            type="button"
             onClick={() => setDropdownOpen(!dropdownOpen)}
             className="h-8 w-8 rounded-full overflow-hidden bg-primary flex items-center justify-center text-xs font-medium text-primary-foreground hover:opacity-90 transition-opacity"
             aria-label={tHeader('userMenu')}
@@ -192,6 +195,7 @@ export function Header() {
                   className="flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm text-foreground hover:bg-muted transition-colors"
                 >
                   <svg
+                    aria-hidden="true"
                     xmlns="http://www.w3.org/2000/svg"
                     width="16"
                     height="16"
@@ -221,7 +225,7 @@ export function Header() {
                         : 'text-foreground hover:bg-muted'
                     }`}
                   >
-                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                    <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                       <path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z" />
                     </svg>
                     {tHeader('admin.label')}
@@ -233,6 +237,7 @@ export function Header() {
               <div className="border-t border-border my-1" />
               <div className="px-2 py-1">
                 <button
+                  type="button"
                   onClick={() => {
                     setDropdownOpen(false);
                     logout();
@@ -240,6 +245,7 @@ export function Header() {
                   className="flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm text-foreground hover:bg-muted transition-colors"
                 >
                   <svg
+                    aria-hidden="true"
                     xmlns="http://www.w3.org/2000/svg"
                     width="16"
                     height="16"
diff --git a/apps/web/src/components/layout/sidebar-footer.tsx b/apps/web/src/components/layout/sidebar-footer.tsx
index c1c4dd6..f1b4faf 100644
--- a/apps/web/src/components/layout/sidebar-footer.tsx
+++ b/apps/web/src/components/layout/sidebar-footer.tsx
@@ -28,8 +28,13 @@ export function SidebarFooter() {
       )}
 
       {/* Settings */}
-      <button className="flex items-center gap-3 rounded-md px-2 py-1.5 text-sm text-sidebar-foreground hover:bg-muted transition-colors">
+      <button
+        type="button"
+        aria-label={t('settings')}
+        className="flex items-center gap-3 rounded-md px-2 py-1.5 text-sm text-sidebar-foreground hover:bg-muted transition-colors"
+      >
         <svg
+          aria-hidden="true"
           xmlns="http://www.w3.org/2000/svg"
           width="18"
           height="18"
diff --git a/apps/web/src/components/layout/sidebar.tsx b/apps/web/src/components/layout/sidebar.tsx
index 5346d47..f89e619 100644
--- a/apps/web/src/components/layout/sidebar.tsx
+++ b/apps/web/src/components/layout/sidebar.tsx
@@ -21,6 +21,7 @@ interface SidebarModule {
 
 export function Sidebar() {
   const t = useTranslations('sidebar');
+  const tCommon = useTranslations('common');
   const { isCollapsed, isMobileOpen, toggle, setMobileOpen } = useSidebarStore();
   const [activeModules, setActiveModules] = useState<SidebarModule[]>([]);
   const [searchQuery, setSearchQuery] = useState('');
@@ -94,8 +95,8 @@ export function Sidebar() {
       <nav className="flex-1 overflow-y-auto p-3">
         <ul className="flex flex-col gap-1">
           <li>
-            <Link href="/" className={linkClass('/')}>
-              <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="shrink-0">
+            <Link href="/" className={linkClass('/')} aria-label={t('dashboard')}>
+              <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="shrink-0">
                 <rect x="3" y="3" width="7" height="7" />
                 <rect x="14" y="3" width="7" height="7" />
                 <rect x="14" y="14" width="7" height="7" />
@@ -105,8 +106,8 @@ export function Sidebar() {
             </Link>
           </li>
           <li>
-            <Link href="/marketplace" className={linkClass('/marketplace')}>
-              <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="shrink-0">
+            <Link href="/marketplace" className={linkClass('/marketplace')} aria-label={t('marketplace')}>
+              <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="shrink-0">
                 <circle cx="9" cy="21" r="1" />
                 <circle cx="20" cy="21" r="1" />
                 <path d="M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6" />
@@ -140,6 +141,7 @@ export function Sidebar() {
                     {filteredCategories.map(([category, mods]) => (
                       <li key={category}>
                         <button
+                          type="button"
                           onClick={() => toggleCategory(category)}
                           className={`flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-xs font-medium transition-colors ${
                             isActive(`/modules/${category}`)
@@ -147,13 +149,13 @@ export function Sidebar() {
                               : 'text-muted-foreground hover:bg-muted hover:text-foreground'
                           }`}
                         >
-                          <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="shrink-0">
+                          <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="shrink-0">
                             <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
                           </svg>
                           <span className="capitalize">{category.replace(/-/g, ' ')}</span>
                           <span className="ml-auto flex items-center gap-1.5">
                             <span className="text-[10px] text-muted-foreground/60">{mods.length}</span>
-                            <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={`transition-transform duration-200 ${openCategories.has(category) ? 'rotate-180' : ''}`}>
+                            <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={`transition-transform duration-200 ${openCategories.has(category) ? 'rotate-180' : ''}`}>
                               <polyline points="6 9 12 15 18 9" />
                             </svg>
                           </span>
@@ -188,11 +190,12 @@ export function Sidebar() {
 
       <div className="hidden md:block border-t border-sidebar-border p-2">
         <button
+          type="button"
           onClick={toggle}
           className="flex w-full items-center gap-3 rounded-md px-2 py-1.5 text-sm text-sidebar-foreground hover:bg-muted transition-colors"
           aria-label={isCollapsed ? t('expand') : t('collapse')}
         >
-          <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={`shrink-0 transition-transform duration-200 ${isCollapsed ? 'rotate-180' : ''}`}>
+          <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={`shrink-0 transition-transform duration-200 ${isCollapsed ? 'rotate-180' : ''}`}>
             <polyline points="15 18 9 12 15 6" />
           </svg>
           {!isCollapsed && <span className="truncate">{t('collapse')}</span>}
@@ -241,10 +244,12 @@ export function Sidebar() {
                       wordmarkClassName="dark:text-primary"
                     />
               <button
+                type="button"
                 onClick={() => setMobileOpen(false)}
+                aria-label={tCommon('close')}
                 className="rounded-md p-2 text-muted-foreground hover:bg-muted hover:text-foreground transition-colors"
               >
-                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                   <line x1="18" y1="6" x2="6" y2="18" />
                   <line x1="6" y1="6" x2="18" y2="18" />
                 </svg>
diff --git a/apps/web/src/components/locale-switcher.tsx b/apps/web/src/components/locale-switcher.tsx
index be639cb..628f37c 100644
--- a/apps/web/src/components/locale-switcher.tsx
+++ b/apps/web/src/components/locale-switcher.tsx
@@ -22,6 +22,7 @@ export function LocaleSwitcher() {
 
   return (
     <button
+      type="button"
       onClick={switchLocale}
       disabled={isPending}
       className="inline-flex items-center justify-center rounded-md px-2.5 py-1.5 text-sm font-medium text-muted-foreground hover:bg-muted hover:text-foreground transition-colors disabled:opacity-50"
diff --git a/apps/web/src/components/settings/account-settings-form.tsx b/apps/web/src/components/settings/account-settings-form.tsx
index eba691d..963f7bf 100644
--- a/apps/web/src/components/settings/account-settings-form.tsx
+++ b/apps/web/src/components/settings/account-settings-form.tsx
@@ -367,7 +367,7 @@ export function AccountSettingsForm() {
                 className="flex items-center justify-center rounded-md bg-primary px-4 py-2.5 text-sm font-medium text-primary-foreground hover:opacity-90 transition-opacity disabled:opacity-50"
               >
                 {isPwPending ? (
-                  <svg className="animate-spin h-4 w-4" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
+                  <svg aria-hidden="true" className="animate-spin h-4 w-4" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
                     <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
                     <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
                   </svg>
diff --git a/apps/web/src/components/settings/calendar-settings-panel.tsx b/apps/web/src/components/settings/calendar-settings-panel.tsx
index 22b7eed..e5f2b49 100644
--- a/apps/web/src/components/settings/calendar-settings-panel.tsx
+++ b/apps/web/src/components/settings/calendar-settings-panel.tsx
@@ -162,6 +162,7 @@ export function CalendarSettingsPanel() {
                   aria-label="Sync error"
                 >
                   <svg
+                    aria-hidden="true"
                     xmlns="http://www.w3.org/2000/svg"
                     width="16"
                     height="16"
@@ -180,6 +181,7 @@ export function CalendarSettingsPanel() {
               ) : testResults[source.id] === 'success' ? (
                 <span className="text-green-500" aria-label="Connection OK">
                   <svg
+                    aria-hidden="true"
                     xmlns="http://www.w3.org/2000/svg"
                     width="16"
                     height="16"
@@ -196,6 +198,7 @@ export function CalendarSettingsPanel() {
               ) : testResults[source.id] === 'error' ? (
                 <span className="text-orange-500" aria-label="Connection error">
                   <svg
+                    aria-hidden="true"
                     xmlns="http://www.w3.org/2000/svg"
                     width="16"
                     height="16"
@@ -243,6 +246,7 @@ export function CalendarSettingsPanel() {
                 aria-label={`Edit ${source.name}`}
               >
                 <svg
+                  aria-hidden="true"
                   xmlns="http://www.w3.org/2000/svg"
                   width="16"
                   height="16"
@@ -266,6 +270,7 @@ export function CalendarSettingsPanel() {
                 aria-label={`Delete ${source.name}`}
               >
                 <svg
+                  aria-hidden="true"
                   xmlns="http://www.w3.org/2000/svg"
                   width="16"
                   height="16"
diff --git a/apps/web/src/components/settings/search-provider-form.tsx b/apps/web/src/components/settings/search-provider-form.tsx
index f3d602f..7bbedd2 100644
--- a/apps/web/src/components/settings/search-provider-form.tsx
+++ b/apps/web/src/components/settings/search-provider-form.tsx
@@ -130,6 +130,7 @@ export function SearchProviderForm() {
                     aria-label={`Remove ${provider.name}`}
                   >
                     <svg
+                      aria-hidden="true"
                       xmlns="http://www.w3.org/2000/svg"
                       width="14"
                       height="14"
diff --git a/apps/web/src/components/settings/widget-settings-panel.tsx b/apps/web/src/components/settings/widget-settings-panel.tsx
index 9773f42..3f40dc1 100644
--- a/apps/web/src/components/settings/widget-settings-panel.tsx
+++ b/apps/web/src/components/settings/widget-settings-panel.tsx
@@ -127,6 +127,7 @@ export function WidgetSettingsPanel({
                           )}
                       </span>
                       <svg
+                        aria-hidden="true"
                         xmlns="http://www.w3.org/2000/svg"
                         width="16"
                         height="16"
diff --git a/apps/web/src/components/theme-toggle.tsx b/apps/web/src/components/theme-toggle.tsx
index f205959..b929aba 100644
--- a/apps/web/src/components/theme-toggle.tsx
+++ b/apps/web/src/components/theme-toggle.tsx
@@ -33,6 +33,7 @@ export function ThemeToggle() {
 
   return (
     <button
+      type="button"
       onClick={cycleTheme}
       className="inline-flex items-center justify-center rounded-md p-2 text-muted-foreground hover:bg-muted hover:text-foreground transition-colors"
       aria-label={label}
@@ -42,6 +43,7 @@ export function ThemeToggle() {
         <span className="h-5 w-5" />
       ) : theme === 'light' ? (
         <svg
+          aria-hidden="true"
           xmlns="http://www.w3.org/2000/svg"
           width="20"
           height="20"
@@ -64,6 +66,7 @@ export function ThemeToggle() {
         </svg>
       ) : theme === 'dark' ? (
         <svg
+          aria-hidden="true"
           xmlns="http://www.w3.org/2000/svg"
           width="20"
           height="20"
@@ -78,6 +81,7 @@ export function ThemeToggle() {
         </svg>
       ) : (
         <svg
+          aria-hidden="true"
           xmlns="http://www.w3.org/2000/svg"
           width="20"
           height="20"