Prevent automatic redirect after successful receipt upload to allow viewing OCR results

[AsadAhmedSaiyed]

Fixes #12

• Description:
  This PR addresses a UX issue on the Receipts page where the extracted receipt data would flash briefly and then the user would be automatically redirected to the dashboard.

• Changes Made

1. Removed the automatic redirect (navigate('/dashboard')) after a successful upload.
2. Replaced the blocking alert() with a non-blocking toast notification using react-toastify.
3. Ensures the “Last Upload Result” card remains visible after a successful OCR scan so users can review extracted data.
4. No functional changes to the backend or OCR processing.
5. Added "Go to Dashboard" button for screen sizes <767px.

• Before

1. After uploading a receipt, the page immediately navigated to the dashboard.
2. Users could not verify the OCR results.

• After

1. Users remain on the Receipts page after a successful upload.
2. A toast notification confirms the successful transaction creation.
3. The Last Upload Result card displays the extracted data persistently.

• Steps to Test

1. Log in to the application.
2. Navigate to the Receipts page.
3. Select a valid receipt image and click Upload & Create Transaction.
4. Observe that the Last Upload Result card populates with the extracted data.
5. Confirm that a toast notification appears and the page does not redirect automatically.

• Screenshot:

[netlify]

✅ Deploy Preview for paisable ready!

Name	Link
🔨 Latest commit	b4033d2
🔍 Latest deploy log	https://app.netlify.com/projects/paisable/deploys/68f7a8243d3e5c000855dde2
😎 Deploy Preview	https://deploy-preview-152--paisable.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 83 Accessibility: 100 Best Practices: 100 SEO: 91 PWA: 80 View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[archa8]

LGTM!