fix: prevent cursor jumping in ModelParameters text/number inputs

Use local state during editing and sync to store on blur, preventing
React Flow re-renders from resetting cursor position on every keystroke.
Also add click-to-seek on GenerateAudioNode waveform.

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

src/components/__tests__/ModelParameters.test.tsx

@@ -284,9 +284,9 @@ describe("ModelParameters", () => {
         expect(screen.getByRole("textbox")).toBeInTheDocument();
       });
 
-      fireEvent.change(screen.getByRole("textbox"), {
+      const textbox = screen.getByRole("textbox");
-        target: { value: "new value" },
+      fireEvent.change(textbox, { target: { value: "new value" } });
-      });
+      fireEvent.blur(textbox);
 
       expect(onParametersChange).toHaveBeenCalledWith({ prompt: "new value" });
     });

src/components/nodes/ModelParameters.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState, useEffect, useCallback } from "react";
+import { useState, useEffect, useCallback, useRef } from "react";
 import { ProviderType, ModelInputDef } from "@/types";
 import { ModelParameter } from "@/lib/providers/types";
 import { useProviderApiKeys } from "@/store/workflowStore";
@@ -250,13 +250,29 @@ interface ParameterInputProps {
 }
 
 /**
- * Individual parameter input based on type
+ * Individual parameter input based on type.
+ * Text and number inputs use local state during editing to prevent
+ * cursor-jump issues caused by React Flow re-renders on store updates.
  */
 function ParameterInput({ param, value, onChange }: ParameterInputProps) {
   const displayName = param.name
     .replace(/_/g, " ")
     .replace(/\b\w/g, (c) => c.toUpperCase());
 
+  // Local state for text/number inputs to prevent cursor jumping
+  const [localValue, setLocalValue] = useState<string>(() => {
+    if (value === undefined || value === null) return "";
+    return String(value);
+  });
+  const isFocusedRef = useRef(false);
+
+  // Sync from store when not focused (external changes)
+  useEffect(() => {
+    if (!isFocusedRef.current) {
+      setLocalValue(value === undefined || value === null ? "" : String(value));
+    }
+  }, [value]);
+
   // Determine input type and render accordingly
   if (param.enum && param.enum.length > 0) {
     // Enum: render as select
@@ -319,15 +335,13 @@ function ParameterInput({ param, value, onChange }: ParameterInputProps) {
   }
 
   if (param.type === "number" || param.type === "integer") {
-    // Number: render as number input with validation
-    const numValue = value !== undefined ? Number(value) : "";
     const hasMin = param.minimum !== undefined;
     const hasMax = param.maximum !== undefined;
 
     // Validate current value against constraints
     let validationError: string | null = null;
-    if (value !== undefined && value !== "" && !isNaN(Number(value))) {
+    if (localValue !== "" && !isNaN(Number(localValue))) {
-      const num = Number(value);
+      const num = Number(localValue);
       if (hasMin && num < param.minimum!) {
         validationError = `Min: ${param.minimum}`;
       } else if (hasMax && num > param.maximum!) {
@@ -352,16 +366,20 @@ function ParameterInput({ param, value, onChange }: ParameterInputProps) {
         </label>
         <input
           type="number"
-          value={numValue}
+          value={localValue}
           min={param.minimum}
           max={param.maximum}
           step={param.type === "integer" ? 1 : 0.1}
+          onFocus={() => { isFocusedRef.current = true; }}
           onChange={(e) => {
-            const val = e.target.value;
+            setLocalValue(e.target.value);
-            if (val === "") {
+          }}
+          onBlur={() => {
+            isFocusedRef.current = false;
+            if (localValue === "") {
               onChange(undefined);
             } else {
-              const num = param.type === "integer" ? parseInt(val, 10) : parseFloat(val);
+              const num = param.type === "integer" ? parseInt(localValue, 10) : parseFloat(localValue);
               onChange(isNaN(num) ? undefined : num);
             }
           }}
@@ -384,7 +402,7 @@ function ParameterInput({ param, value, onChange }: ParameterInputProps) {
     return null;
   }
 
-  // Default: string input
+  // Default: string input — uses local state, syncs to store on blur
   return (
     <div className="flex flex-col gap-0.5">
       <label
@@ -395,8 +413,15 @@ function ParameterInput({ param, value, onChange }: ParameterInputProps) {
       </label>
       <input
         type="text"
-        value={(value as string) ?? ""}
+        value={localValue}
-        onChange={(e) => onChange(e.target.value || undefined)}
+        onFocus={() => { isFocusedRef.current = true; }}
+        onChange={(e) => {
+          setLocalValue(e.target.value);
+        }}
+        onBlur={() => {
+          isFocusedRef.current = false;
+          onChange(localValue || undefined);
+        }}
         placeholder={param.default !== undefined ? `Default: ${param.default}` : undefined}
         className="nodrag nopan w-full text-[9px] py-0.5 px-1 border border-neutral-700 rounded bg-neutral-900/50 focus:outline-none focus:ring-1 focus:ring-neutral-600 text-neutral-300 placeholder:text-neutral-600"
       />