Improvement: Add property comparison history

[LaGodxy]

Summary

Save users' previous property comparisons so they can revisit them.

Implementation

• Store last 5 comparisons in localStorage
• 'Recent Comparisons' section in comparison tool
• Share comparison via URL
• Delete individual comparisons
• Export comparison as PDF

[Cedarich]

@Cedarich has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello maintainer, can i take up this task

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Cedarich to this issue.

[drips-wave]

Congratulations, @Cedarich! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Cedarich: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @Cedarich as part of the Stellar Wave Program's 4th Wave 🥳

😎 @Cedarich: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.