[Feature]: Collaborative Trip Planning Mode

[Gupta-02]

Feature Description

Enable multiple users to collaboratively edit and manage a shared trip itinerary.

Proposed Solution

Integrate a shared session link system with synchronized updates using local storage simulation or backend API (if extended)

Alternatives Considered

Export/import JSON itinerary file for manual sharing.

Mockups/Screenshots

Shared editing interface with multiple contributor indicators.

Contribution

• I would like to work on this feature

[github-actions]

## 🔁 Possible Duplicate Issue (ECWoC'26)

Hi @Gupta-02 👋,

This issue appears to be **similar to an existing one**:

👉 **#4067 – [Feature]:**

### ✅ What should you do?
- If this is the same problem, please continue the discussion on the existing issue.
- If it's different, kindly explain **how this issue is unique** so maintainers can review it.

Keeping issues clean helps everyone contribute better during **ECWoC'26** 🚀  
Thanks for your understanding! 🙌

---
🤖 *Automated duplicate detection for ECWoC'26*

[github-actions]

Thank you for raising this issue! 🙌

We'll review it as soon as possible. We truly appreciate your contribution! ✨

📌 Before moving ahead:

• Please make sure you've gone through README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md.
• 🚫 Do NOT create a PR until this issue has been assigned to you.

---

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[github-actions]

⏳ Hi @Gupta-02, you already have 4 active issues assigned.

This issue is added to your queue and will be auto-assigned when one of your current issues is closed.

[github-actions]

🎉 @Gupta-02, one of your issues was closed, so this queued issue is now assigned to you.

You now have 4/4 active issues.

[github-actions]

⏰ Inactivity Warning

Hi @Gupta-02! 👋

This issue has been inactive for 15 hours.

Please provide an update within the next 15 hours, or you may be automatically unassigned to give others a chance to contribute.

💡 If you need more time, just leave a comment to reset the timer!

[github-actions]

⏰ Inactivity Warning

Hi @Gupta-02! 👋

This issue has been inactive for 16 hours.

Please provide an update within the next 15 hours, or you may be automatically unassigned to give others a chance to contribute.

💡 If you need more time, just leave a comment to reset the timer!

[github-actions]

⏰ Inactivity Warning

Hi @Gupta-02! 👋

This issue has been inactive for 15 hours.

Please provide an update within the next 15 hours, or you may be automatically unassigned to give others a chance to contribute.

💡 If you need more time, just leave a comment to reset the timer!