fix(workspace): automatically refocus text field and place cursor at end after slash commands

frontend/src/features/workspace/WorkspaceView.tsx

@@ -944,7 +944,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
         );
         return;
       }
-      if (e.key === 'Enter') {
+      if (e.key === 'Enter' || e.key === 'Tab') {
         e.preventDefault();
         const selected = filteredSlashCommands[slashSelectedIndex];
         if (selected) {
@@ -1017,6 +1017,27 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
     updateBlock(blockId, { type, content: cleanContent, checked: type === 'todo' ? false : undefined });
     setSlashBlockId(null);
     setSlashSearch('');
+
+    // Re-focus immediately into the block's text field and position cursor at end
+    const focusBlock = () => {
+      const el = blockInputRefs.current[blockId];
+      if (el) {
+        el.focus();
+        if ('setSelectionRange' in el && typeof (el as any).value === 'string') {
+          const len = (el as any).value.length;
+          (el as any).setSelectionRange(len, len);
+        }
+        return true;
+      }
+      return false;
+    };
+
+    setLastFocusedBlockId(blockId);
+    setTimeout(() => {
+      if (!focusBlock()) {
+        setTimeout(focusBlock, 30);
+      }
+    }, 20);
   };
 
   const getDirectChildTodos = (blocks: DocumentBlock[], parentIndex: number): DocumentBlock[] => {
@@ -2415,6 +2436,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
                                   <button
                                     key={cmd.type}
                                     type="button"
+                                    onMouseDown={(e) => e.preventDefault()}
                                     onClick={() => applySlashCommand(block.id, cmd.type)}
                                     className={`w-full text-left px-2 py-1.5 rounded-btn text-xs flex items-center justify-between transition-colors ${
                                       slashSelectedIndex === idx