feat: initialize new React application structure with TypeScript, ESLint, and Prettier configurations, while removing legacy files and adding new components and pages for enhanced functionality

src/components/ui/HeaderInputList.tsx

@@ -0,0 +1,74 @@
+import { Fragment } from 'react';
+import { Button } from './Button';
+import type { HeaderEntry } from '@/utils/headers';
+
+interface HeaderInputListProps {
+  entries: HeaderEntry[];
+  onChange: (entries: HeaderEntry[]) => void;
+  addLabel: string;
+  disabled?: boolean;
+  keyPlaceholder?: string;
+  valuePlaceholder?: string;
+}
+
+export function HeaderInputList({
+  entries,
+  onChange,
+  addLabel,
+  disabled = false,
+  keyPlaceholder = 'X-Custom-Header',
+  valuePlaceholder = 'value'
+}: HeaderInputListProps) {
+  const currentEntries = entries.length ? entries : [{ key: '', value: '' }];
+
+  const updateEntry = (index: number, field: 'key' | 'value', value: string) => {
+    const next = currentEntries.map((entry, idx) => (idx === index ? { ...entry, [field]: value } : entry));
+    onChange(next);
+  };
+
+  const addEntry = () => {
+    onChange([...currentEntries, { key: '', value: '' }]);
+  };
+
+  const removeEntry = (index: number) => {
+    const next = currentEntries.filter((_, idx) => idx !== index);
+    onChange(next.length ? next : [{ key: '', value: '' }]);
+  };
+
+  return (
+    <div className="header-input-list">
+      {currentEntries.map((entry, index) => (
+        <Fragment key={index}>
+          <div className="header-input-row">
+            <input
+              className="input"
+              placeholder={keyPlaceholder}
+              value={entry.key}
+              onChange={(e) => updateEntry(index, 'key', e.target.value)}
+              disabled={disabled}
+            />
+            <span className="header-separator">:</span>
+            <input
+              className="input"
+              placeholder={valuePlaceholder}
+              value={entry.value}
+              onChange={(e) => updateEntry(index, 'value', e.target.value)}
+              disabled={disabled}
+            />
+            <Button
+              variant="ghost"
+              size="sm"
+              onClick={() => removeEntry(index)}
+              disabled={disabled || currentEntries.length <= 1}
+            >
+              ✕
+            </Button>
+          </div>
+        </Fragment>
+      ))}
+      <Button variant="secondary" size="sm" onClick={addEntry} disabled={disabled} className="align-start">
+        {addLabel}
+      </Button>
+    </div>
+  );
+}