feat: add input history, ID-based sorting, and loading states to comparator

[Ahmedhossamdev]

Fix: #30

Summary

• Add URL and input parameter history with localStorage persistence
• Implement "Sort by ID" feature to align matching items in diff viewer
• Add loading overlay for large data processing
• Add new Trip endpoint and scheduleRelationship search support

Changes

ComparatorPanel.svelte

• Persist server URLs to history (last 5 URLs each)
• Persist parameter input values with endpoint-specific keys
• Display datalist dropdowns for URL and parameter suggestions
• Show loading overlay when processing large responses (>500KB)

DiffViewer.svelte

• Add "Sort by ID" button to sort arrays by ID fields
• Match items across both sides by ID for aligned comparison
• Toggle between sorted and original view

JsonTree.svelte

• Reduced initial root chunk size for better performance

ProtobufViewer.svelte

• Display scheduleRelationship badge in trip info

endpoints.ts

• Add new Trip endpoint

jsonCompare.ts

• Add ID field detection and sorting utilities
• Add sortById, findIdValue, sortTopLevelArrays, matchArraysById functions
• Update existing sort calls to use ID-based sorting