Add interactive tree view to JSON parser

[GhDj]

Summary

• Add Tree View button to visualize JSON structure
• Collapsible/expandable nodes with arrow controls
• Color-coded data types (strings, numbers, booleans, null, objects, arrays)
• Copy path (JSONPath) and value functionality
• Expand all / Collapse all buttons
• Toast notifications for copy actions
• Text/Tree view toggle in output panel
• Updated SEO meta tags for tree view feature

Test plan

• Enter valid JSON and click "Tree View" button
• Verify tree renders with collapsible arrows
• Click arrows to expand/collapse nodes
• Test "Expand All" and "Collapse All" buttons
• Click "path" to copy JSONPath, verify toast notification
• Click "value" to copy value, verify toast notification
• Toggle between Text and Tree view modes
• Test with nested objects and arrays
• Test with invalid JSON (should show error)
• Verify dark mode styling