Security: Remove sensitive business data from repository

- Remove Excel business tracker spreadsheet from git tracking
- Enhanced .gitignore to exclude all business documents:
  - CSV files, Excel files, PDF documents
  - Transaction statements and business trackers
  - Preserve essential config files (package.json, tsconfig, etc.)
- Protect sensitive financial and customer data from public exposure

.gitignore

@@ -95,9 +95,29 @@ temp/
 ehthumbs.db
 Thumbs.db
 
-# Data files (optional - remove if you want to include sample data)
+# Data files - NEVER commit sensitive business data
 *.csv
+*.xlsx
+*.xls
 *.pdf
+*.json
+!package.json
+!package-lock.json
+!tsconfig*.json
+!tailwind.config.js
+!vite.config.ts
+!postcss.config.js
+
+# Business documents and statements
+*statement*
+*Statement*
+*transaction*
+*Transaction*
+*business*
+*Business*
+*tracker*
+*Tracker*
+LayerXLayer*
 
 # Local development files
 .vscode/settings.json