[Feature] PDF to Excel

[ayushcmd]

Summary

Extract tables from PDF and export as .xlsx.

Files to create/edit

• src/pages/tools/PdfToExcel.tsx → create
• src/App.tsx → add import + route /tools/pdf-to-excel
• src/pages/Tools.tsx → add to allTools[]

Implementation notes

• Use pdfjs-dist to extract text/table content
• Use xlsx (SheetJS) to generate .xlsx
• Handle multi-page PDFs with multiple sheets

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