Refactor Invoice Application UI to Have Hard Edges

[devin-ai-integration]

Refactor Invoice Application UI to Have Hard Edges

Summary

This PR removes rounded corners from all major UI elements by changing border-radius values to 0 in the global CSS file. The changes affect:

• .btn class: buttons throughout the application
• .form-input class: all input fields
• .form-textarea class: all textarea elements
• .card class: all card containers

All affected elements now have sharp corners (hard edges) instead of rounded corners, giving the application a more angular, geometric visual style.

Review & Testing Checklist for Human

⚠️ Important: Visual verification required across entire application

• Navigate through all major app sections (Dashboard, Invoices, Reports, Profile) and verify UI elements have hard edges
• Test the Login and Registration flows to ensure forms look correct with hard edges
• Check the Navbar component and all navigation buttons have proper hard edges
• Verify the overall design aesthetic still looks good with the angular/sharp corner style
• Look for any UI elements that might be broken or look odd with the new hard edges

Notes

• ✅ Successfully tested on Login and Registration pages - hard edges are working correctly
• ⚠️ Could not fully test dashboard, invoices, and reports pages due to authentication issues during development
• The changes use a centralized CSS approach, so modifications should propagate consistently throughout the app
• All border-radius values were changed from 0.375rem/0.5rem to 0 as specified in requirements

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Link to Devin run: https://app.devin.ai/sessions/15d907c48a6d48f49e2c57d9c9e5a4d3
Requested by: @JRWu (jia.wu@codeium.com)

[devin-ai-integration]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud