fix: add aria-labels to icon-only buttons

frontend/src/app/dashboard/page.tsx

@@ -835,18 +835,19 @@ Start writing your LaTeX document here...
                       </td>
                       <td>
                         <div className="dash-td-actions">
-                          <button className="dash-icon-btn" aria-label="Copy">
+                          <button className="dash-icon-btn" aria-label="Copy" title="Copy project">
                             <IconCopy size={15} />
                           </button>
-                          <button className="dash-icon-btn" aria-label="Download">
+                          <button className="dash-icon-btn" aria-label="Download" title="Download project">
                             <IconDownload size={15} />
                           </button>
-                          <button className="dash-icon-btn" aria-label="Share">
+                          <button className="dash-icon-btn" aria-label="Share" title="Share project">
                             <IconShare size={15} />
                           </button>
                           <button
                             className="dash-icon-btn"
                             aria-label="Delete"
+                            title="Delete project"
                             onClick={(e) => handleDeleteOne(project.id, e)}
                           >
                             <IconTrashSmall size={15} />
@@ -996,4 +997,4 @@ Start writing your LaTeX document here...
       )}
     </div>
   );
-}
+}

frontend/src/components/ActivityBar.tsx

@@ -38,6 +38,7 @@ export default function ActivityBar({
       <button
         onClick={onToggleSidebar}
         className="w-8 h-8 rounded-md flex items-center justify-center text-text-secondary hover:bg-bg-secondary hover:text-text-primary transition-colors"
+        aria-label={sidebarOpen ? "Hide sidebar" : "Show sidebar"}
         title={sidebarOpen ? "Hide sidebar" : "Show sidebar"}
       >
         <PanelLeft size={16} />
@@ -57,6 +58,7 @@ export default function ActivityBar({
                 ? "bg-accent-bg text-accent font-medium shadow-sm"
                 : "text-text-secondary hover:bg-bg-secondary hover:text-text-primary"
             }`}
+            aria-label={item.label}
             title={item.label}
           >
             <Icon size={16} />
@@ -69,10 +71,11 @@ export default function ActivityBar({
       <button
         onClick={() => router.push("/settings")}
         className="w-8 h-8 rounded-md flex items-center justify-center text-text-secondary hover:bg-bg-secondary hover:text-text-primary transition-colors cursor-pointer"
+        aria-label="Settings"
         title="Settings"
       >
         <Settings size={16} />
       </button>
     </div>
   );
-}
+}

frontend/src/components/PaneHeader.tsx

@@ -34,6 +34,7 @@ export default function PaneHeader({
           <button
             onClick={onDownload}
             className="w-5 h-5 rounded flex items-center justify-center text-text-secondary hover:bg-bg-primary hover:text-text-primary transition-colors cursor-pointer"
+            aria-label="Download PDF"
             title="Download PDF"
           >
             <Download size={12} />
@@ -42,4 +43,4 @@ export default function PaneHeader({
       </div>
     </div>
   );
-}
+}

frontend/src/components/ShareModal.tsx

@@ -86,6 +86,7 @@ export default function ShareModal({
           <button
             onClick={onClose}
             className="w-6 h-6 rounded-md flex items-center justify-center text-text-secondary hover:bg-bg-secondary hover:text-text-primary transition-colors cursor-pointer"
+            aria-label="Close share dialog"
           >
             <X size={14} />
           </button>
@@ -161,6 +162,7 @@ export default function ShareModal({
                   <button
                     onClick={handleCopy}
                     className="h-8 w-8 rounded-md border border-border-secondary flex items-center justify-center bg-bg-primary hover:bg-bg-secondary transition-colors cursor-pointer"
+                    aria-label={copied ? "Invitation link copied" : "Copy invitation link"}
                     title="Copy to clipboard"
                   >
                     {copied ? (

frontend/src/components/Sidebar.tsx

@@ -270,6 +270,7 @@ export default function Sidebar({
                       <button
                         onClick={onFileCreate}
                         className="p-0.5 rounded hover:bg-bg-primary hover:text-text-primary transition-colors cursor-pointer"
+                        aria-label="Create new file"
                         title="Create new file"
                       >
                         <Plus size={10} />
@@ -609,6 +610,7 @@ function SidebarAiPanel({
         <button
           onClick={() => handleSend(input)}
           disabled={!input.trim() || isTyping}
+          aria-label="Send message"
           className="p-1.5 rounded bg-accent hover:bg-accent-hover disabled:bg-bg-tertiary disabled:text-text-tertiary text-[#0e0f11] transition-all cursor-pointer flex items-center justify-center shrink-0"
         >
           <Send size={13} />

frontend/src/components/UserDropdown.tsx

@@ -120,6 +120,7 @@ export default function UserDropdown() {
         type="button"
         onClick={() => setIsOpen(!isOpen)}
         className="w-7 h-7 rounded-full bg-zinc-200 dark:bg-zinc-800 flex items-center justify-center overflow-hidden text-[10px] font-bold text-zinc-600 dark:text-zinc-300 hover:ring-2 ring-zinc-300 dark:ring-zinc-700 transition-all focus:outline-none"
+        aria-label="Account menu"
         title="Account"
       >
         {user.imageUrl ? (