UI: Improve dataset upload loading & feedback

.gitignore

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+node_modules/

LocalMind-Frontend/src/features/Dashboard/V1/Component/DatasetUpload.tsx

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+import React, { useState } from 'react'
+
+const DatasetUpload: React.FC = () => {
+  const [file, setFile] = useState<File | null>(null)
+  const [isUploading, setIsUploading] = useState(false)
+  const [status, setStatus] = useState<{ type: 'success' | 'error'; message: string } | null>(null)
+
+  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    if (e.target.files && e.target.files[0]) {
+      setFile(e.target.files[0])
+      setStatus(null)
+    }
+  }
+
+  const handleSubmit = async () => {
+    if (!file) return
+
+    if (isUploading) return
+
+    setIsUploading(true)
+    setStatus(null)
+
+    const formData = new FormData()
+    formData.append('file', file)
+
+    try {
+      const response = await fetch('/api/v1/training-datasets/upload', {
+        method: 'POST',
+        body: formData,
+      })
+
+      if (response.ok) {
+        setStatus({ type: 'success', message: 'Dataset uploaded successfully!' })
+        setFile(null)
+      } else {
+        setStatus({ type: 'error', message: 'Failed to upload dataset. Please try again.' })
+      }
+    } catch (error) {
+      setStatus({ type: 'error', message: 'Network error. Please check your connection.' })
+    } finally {
+      setIsUploading(false)
+    }
+  }
+
+  return (
+    <div className="p-6 bg-gray-900 rounded-lg border border-gray-800 text-white max-w-lg mx-auto mt-10">
+      <h2 className="text-xl font-semibold mb-4">Upload Training Data</h2>
+
+      <div className="flex flex-col gap-4">
+        <input
+          type="file"
+          onChange={handleFileChange}
+          disabled={isUploading}
+          className="block w-full text-sm text-gray-400
+            file:mr-4 file:py-2 file:px-4
+            file:rounded-full file:border-0
+            file:text-sm file:font-semibold
+            file:bg-indigo-600 file:text-white
+            hover:file:bg-indigo-700
+            disabled:opacity-50 disabled:cursor-not-allowed"
+        />
+
+        {status && (
+          <div
+            className={`p-3 rounded text-sm ${
+              status.type === 'success'
+                ? 'bg-green-900/50 text-green-300'
+                : 'bg-red-900/50 text-red-300'
+            }`}
+          >
+            {status.message}
+          </div>
+        )}
+
+        <button
+          onClick={handleSubmit}
+          disabled={!file || isUploading}
+          className={`px-4 py-2 rounded font-medium transition-colors
+            ${
+              !file || isUploading
+                ? 'bg-gray-700 text-gray-400 cursor-not-allowed'
+                : 'bg-indigo-600 text-white hover:bg-indigo-700'
+            }
+          `}
+        >
+          {isUploading ? 'Uploading...' : 'Submit Dataset'}
+        </button>
+      </div>
+    </div>
+  )
+}
+
+export default DatasetUpload