Add file upload functionality to SVG viewer

[Copilot]

Overview

Enhanced the SVG viewer tool to support file uploads alongside the existing paste functionality, taking the user experience to the next level as requested in the issue.

Changes Made

New Features

• Tabbed Interface: Added tabs to switch between "Paste SVG Code" and "Upload SVG File" options
• File Upload Component: Created a new SVGUploadComponent with drag-and-drop support and click-to-upload functionality
• File Validation: Validates SVG files by extension (.svg) and content (must contain <svg tag)
• Error Handling: Shows appropriate error messages for invalid files or files exceeding the 2MB size limit

User Experience Improvements

• Seamless Integration: Uploaded SVG content automatically appears in both tabs and can be edited in the paste tab
• Consistent Design: Follows existing design patterns from other file upload utilities in the project
• Visual Feedback: Provides clear status messages during upload, error states, and hover effects

Technical Implementation

• Minimal Code Changes: Reused existing components and patterns, added only necessary new functionality
• Robust Validation: Validates both file extension and SVG content before processing
• Proper State Management: Manages file upload state and error handling correctly
• Component Reusability: Created SVGUploadComponent following the same patterns as ImageUploadComponent

Usage

Users can now:

1. Upload SVG files by dragging and dropping or clicking to select files in the "Upload SVG File" tab
2. Edit uploaded content by switching to the "Paste SVG Code" tab after upload
3. Continue using paste functionality exactly as before in the "Paste SVG Code" tab

Testing

• Added comprehensive test suite covering all new functionality
• All existing tests continue to pass (19 test suites, 153 tests total)
• Manual testing verified with proper error handling for invalid files

Screenshots

The implementation maintains the clean, user-friendly interface while adding powerful new file upload capabilities that complement the existing paste functionality.

Fixes the enhancement request to take the SVG viewer tool to the next level with file upload support.

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