feat: persist mapping and validation comments across page reloads

[sumitdahal7]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation
• 🧑‍💻 Refactor
• ✅ Test
• 🤖 Build or CI
• ❓ Other (please specify)

Related Issue

Fixes hotosm#7254

Describe this PR

This PR introduces persistence for mapping and validation comments across page reloads, ensuring that user progress is not lost on accidental refreshes or navigation.

Key Changes:

• Storage Migration: Replaced sessionStorage with a safeStorage utility (backed by localStorage) for better durability.
• Improved Key Scoping: Updated storage keys to include projectId and taskId (e.g., tm-comment-mapping-{projectId}-{taskId}), preventing comment leakage between different tasks or projects.
• Race Condition Prevention: Implemented a hasMounted ref in CommentInputField to ensure that empty initial states don't overwrite saved drafts before they can be restored.
• Validation Flow Persistence: Added logic to TaskMapAction and CompletionTabForValidation to correctly restore and clear validation comments for multiple tasks simultaneously.
• History Tab persistence: Updated PostComment in task history to also persist drafts using the new storage utility and scoped keys.

Screenshots

Screencast.from.2026-05-26.13-20-27.webm