fix(24-01): fix node UX issues - error display, accessibility, button states, dead code

- LLM error view now shows nodeData.error message below "Generation failed"
- ImageInputNode remove button has aria-label and keyboard focus styles
- ImageInputNode empty state has role=button, tabIndex, keyboard handler
- SplitGrid split button disabled when no source image connected
- PromptNode dead modal code removed, variable dialog has clickable @var trigger
- PromptConstructorNode dead modal code and unused imports removed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/nodes/ImageInputNode.tsx

@@ -114,7 +114,8 @@ export function ImageInputNode({ id, data, selected }: NodeProps<ImageInputNodeT
           />
           <button
             onClick={handleRemove}
-            className="absolute top-2 right-2 w-6 h-6 bg-black/60 hover:bg-red-600/80 text-white rounded text-xs opacity-0 group-hover:opacity-100 transition-all flex items-center justify-center"
+            aria-label="Remove image"
+            className="absolute top-2 right-2 w-6 h-6 bg-black/60 hover:bg-red-600/80 text-white rounded text-xs opacity-0 group-hover:opacity-100 focus:opacity-100 focus:ring-1 focus:ring-red-400 transition-all flex items-center justify-center"
           >
             <svg className="w-3.5 h-3.5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
               <path strokeLinecap="round" strokeLinejoin="round" d="M6 18L18 6M6 6l12 12" />
@@ -123,7 +124,16 @@ export function ImageInputNode({ id, data, selected }: NodeProps<ImageInputNodeT
         </div>
       ) : (
         <div
+          role="button"
+          tabIndex={0}
+          aria-label="Upload image"
           onClick={() => fileInputRef.current?.click()}
+          onKeyDown={(e) => {
+            if (e.key === "Enter" || e.key === " ") {
+              e.preventDefault();
+              fileInputRef.current?.click();
+            }
+          }}
           onDrop={handleDrop}
           onDragOver={handleDragOver}
           className="w-full h-full bg-neutral-900/40 flex flex-col items-center justify-center cursor-pointer hover:bg-neutral-900/60 transition-colors"

src/components/nodes/LLMGenerateNode.tsx

@@ -253,6 +253,9 @@ export function LLMGenerateNode({ id, data, selected }: NodeProps<LLMGenerateNod
               <path strokeLinecap="round" strokeLinejoin="round" d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
             </svg>
             <span className="text-white text-xs font-medium">Generation failed</span>
+            {nodeData.error && (
+              <span className="text-red-200 text-[10px] text-center px-3 mt-1 line-clamp-3">{nodeData.error}</span>
+            )}
           </div>
         ) : nodeData.outputText ? (
           <div className="group/text relative w-full h-full bg-neutral-900/40 p-2 overflow-auto nowheel">

src/components/nodes/PromptConstructorNode.tsx

@@ -1,13 +1,11 @@
 "use client";
 
 import { useCallback, useState, useEffect, useMemo, useRef } from "react";
-import { createPortal } from "react-dom";
 import { Handle, Position, NodeProps, Node } from "@xyflow/react";
 import { BaseNode } from "./BaseNode";
 import { usePromptAutocomplete } from "@/hooks/usePromptAutocomplete";
 import { useWorkflowStore } from "@/store/workflowStore";
 import { PromptConstructorNodeData, PromptNodeData, LLMGenerateNodeData, AvailableVariable } from "@/types";
-import { PromptConstructorEditorModal } from "@/components/modals/PromptConstructorEditorModal";
 import { parseVarTags } from "@/utils/parseVarTags";
 
 type PromptConstructorNodeType = Node<PromptConstructorNodeData, "promptConstructor">;
@@ -17,13 +15,10 @@ export function PromptConstructorNode({ id, data, selected }: NodeProps<PromptCo
   const updateNodeData = useWorkflowStore((state) => state.updateNodeData);
   const edges = useWorkflowStore((state) => state.edges);
   const nodes = useWorkflowStore((state) => state.nodes);
-  const incrementModalCount = useWorkflowStore((state) => state.incrementModalCount);
-  const decrementModalCount = useWorkflowStore((state) => state.decrementModalCount);
 
   // Local state for template to prevent cursor jumping
   const [localTemplate, setLocalTemplate] = useState(nodeData.template);
   const [isEditing, setIsEditing] = useState(false);
-  const [isModalOpenLocal, setIsModalOpenLocal] = useState(false);
 
   const textareaRef = useRef<HTMLTextAreaElement>(null);
 
@@ -158,23 +153,6 @@ export function PromptConstructorNode({ id, data, selected }: NodeProps<PromptCo
     setTimeout(() => closeAutocomplete(), 200);
   }, [id, localTemplate, nodeData.template, updateNodeData, closeAutocomplete]);
 
-  const handleOpenModal = useCallback(() => {
-    setIsModalOpenLocal(true);
-    incrementModalCount();
-  }, [incrementModalCount]);
-
-  const handleCloseModal = useCallback(() => {
-    setIsModalOpenLocal(false);
-    decrementModalCount();
-  }, [decrementModalCount]);
-
-  const handleSubmitModal = useCallback(
-    (template: string) => {
-      updateNodeData(id, { template });
-    },
-    [id, updateNodeData]
-  );
-
   return (
     <>
       <BaseNode
@@ -260,18 +238,6 @@ export function PromptConstructorNode({ id, data, selected }: NodeProps<PromptCo
           style={{ zIndex: 10 }}
         />
       </BaseNode>
-
-      {/* Prompt Constructor Editor Modal - rendered via portal to escape React Flow stacking context */}
-      {isModalOpenLocal && createPortal(
-        <PromptConstructorEditorModal
-          isOpen={isModalOpenLocal}
-          initialTemplate={nodeData.template}
-          availableVariables={availableVariables}
-          onSubmit={handleSubmitModal}
-          onClose={handleCloseModal}
-        />,
-        document.body
-      )}
     </>
   );
 }

src/components/nodes/PromptNode.tsx

@@ -6,18 +6,14 @@ import { Handle, Position, NodeProps, Node } from "@xyflow/react";
 import { BaseNode } from "./BaseNode";
 import { useWorkflowStore } from "@/store/workflowStore";
 import { PromptNodeData } from "@/types";
-import { PromptEditorModal } from "@/components/modals/PromptEditorModal";
 
 type PromptNodeType = Node<PromptNodeData, "prompt">;
 
 export function PromptNode({ id, data, selected }: NodeProps<PromptNodeType>) {
   const nodeData = data;
   const updateNodeData = useWorkflowStore((state) => state.updateNodeData);
-  const incrementModalCount = useWorkflowStore((state) => state.incrementModalCount);
-  const decrementModalCount = useWorkflowStore((state) => state.decrementModalCount);
   const getConnectedInputs = useWorkflowStore((state) => state.getConnectedInputs);
   const edges = useWorkflowStore((state) => state.edges);
-  const [isModalOpenLocal, setIsModalOpenLocal] = useState(false);
 
   // Local state for prompt to prevent cursor jumping during typing
   const [localPrompt, setLocalPrompt] = useState(nodeData.prompt);
@@ -75,23 +71,6 @@ export function PromptNode({ id, data, selected }: NodeProps<PromptNodeType>) {
     }
   }, [id, localPrompt, nodeData.prompt, updateNodeData]);
 
-  const handleOpenModal = useCallback(() => {
-    setIsModalOpenLocal(true);
-    incrementModalCount();
-  }, [incrementModalCount]);
-
-  const handleCloseModal = useCallback(() => {
-    setIsModalOpenLocal(false);
-    decrementModalCount();
-  }, [decrementModalCount]);
-
-  const handleSubmitModal = useCallback(
-    (prompt: string) => {
-      updateNodeData(id, { prompt });
-    },
-    [id, updateNodeData]
-  );
-
   const handleSaveVariableName = useCallback(() => {
     updateNodeData(id, { variableName: varNameInput || undefined });
     setShowVarDialog(false);
@@ -133,11 +112,13 @@ export function PromptNode({ id, data, selected }: NodeProps<PromptNodeType>) {
           placeholder={hasIncomingTextConnection ? "Text from connected node (editable)..." : "Describe what to generate..."}
           className="nodrag nopan nowheel w-full h-full p-3 text-xs leading-relaxed text-neutral-100 bg-neutral-800 rounded-lg resize-none focus:outline-none placeholder:text-neutral-500"
         />
-        {nodeData.variableName && (
-          <div className="absolute bottom-2 left-3 z-10 text-[10px] text-blue-400 pointer-events-none">
-            @{nodeData.variableName}
-          </div>
-        )}
+        <button
+          onClick={() => setShowVarDialog(true)}
+          className="nodrag nopan absolute bottom-2 left-3 z-10 text-[10px] text-blue-400 hover:text-blue-300 transition-colors"
+          title="Set variable name"
+        >
+          @{nodeData.variableName || "var"}
+        </button>
 
         {/* Text output handle */}
         <Handle
@@ -149,17 +130,6 @@ export function PromptNode({ id, data, selected }: NodeProps<PromptNodeType>) {
         />
       </BaseNode>
 
-      {/* Prompt Editor Modal - rendered via portal to escape React Flow stacking context */}
-      {isModalOpenLocal && createPortal(
-        <PromptEditorModal
-          isOpen={isModalOpenLocal}
-          initialPrompt={nodeData.prompt}
-          onSubmit={handleSubmitModal}
-          onClose={handleCloseModal}
-        />,
-        document.body
-      )}
-
       {/* Variable Naming Dialog - rendered via portal */}
       {showVarDialog && createPortal(
         <div className="fixed inset-0 bg-black/60 flex items-center justify-center z-[9999]">

src/components/nodes/SplitGridNode.tsx

@@ -148,9 +148,9 @@ export function SplitGridNode({ id, data, selected }: NodeProps<SplitGridNodeTyp
             {/* Split button */}
             <button
               onClick={handleSplit}
-              disabled={isRunning || !nodeData.isConfigured}
+              disabled={isRunning || !nodeData.isConfigured || !nodeData.sourceImage}
               className="nodrag nopan px-2 py-0.5 text-[10px] border border-white hover:bg-white hover:text-neutral-900 disabled:border-neutral-600 disabled:text-neutral-600 disabled:cursor-not-allowed text-white rounded transition-colors"
-              title={!nodeData.isConfigured ? "Configure node first" : "Split grid"}
+              title={!nodeData.isConfigured ? "Configure node first" : !nodeData.sourceImage ? "Connect an image first" : "Split grid"}
             >
               Split
             </button>