feat: Integrate PapaParse for CSV handling

Adds papaparse as a dependency and updates the data processing service to use it for more robust CSV file parsing. This replaces manual CSV parsing logic with a dedicated library, improving reliability and handling of various CSV formats.

Also renames the `MoversIcon` to `TrendingIcon` to better reflect its usage in indicating trending performance metrics.

components/FileUpload.tsx

@@ -1,3 +1,4 @@
+
 import React, { ChangeEvent, useState } from 'react';
 import { UploadIcon } from './Icons'; 
 
@@ -85,13 +86,13 @@ const FileUpload: React.FC<FileUploadProps> = ({
             <UploadIcon />
           </div>
           <div className="text-center">
-            <h3 className="font-semibold text-slate-200">Upload Data File</h3>
-            <p className="text-xs text-slate-500 mt-1">Supports .csv, .xlsx, .xls</p>
+            <h3 className="font-semibold text-slate-200">Upload Local CSV</h3>
+            <p className="text-xs text-slate-500 mt-1">Click to select file</p>
           </div>
           <input
             id="file-upload"
             type="file"
-            accept=".csv, .xlsx, .xls"
+            accept=".csv"
             onChange={handleChange}
             disabled={isLoading}
             className="hidden"
@@ -138,4 +139,4 @@ const FileUpload: React.FC<FileUploadProps> = ({
   );
 };
 
-export default FileUpload;
+export default FileUpload;