Add mapper frontend using ElectricSQL ShapeStream (live updates)

[spwoodcock]

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

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

Related Issue

Foundation for issues in milestone: https://github.com/hotosm/fmtm/milestone/36
Related to #1604

Describe this PR

• Adds Electric-SQL sync layer into compose stack.
• Adds route for mapnow/{projectId} mapper frontend (a self-contained Svelte web app).
• Various improvements to the underlying db schema to simplify / facilitate, the main one being globally unique UUID primary key for task_history table (for creation and sync via electric).
• Required a large refactor on the backend around task_history entry management, working towards Redesign project/task/history schemas and relationships to better align with event-driven programming #1610 (includes fix for Simplify and deduplicate tasks.status and task_history information #1604)
• More details to come...

TODO:

• Fix usage of TaskAction vs TaskStatus enum (repeated / redundant info).
• Many improvements to the UI / layout.
• Fix issue where @hotosm/ui is using a relative path to dependency.

Screenshots

Review Guide

Testing this will require:

installing frontend deps locally:

cd src/mapper
pnpm install

image builds + probably clearing existing data:

docker compose down -v
docker compose build
docker compose up -d

I'm not expecting a comprehensive review of this - it will likely not be perfect on first attempt.

Instead I propose we test it roughly, merge it in, then iterate / improve. Bugs can be fixed as we go.

Checklist before requesting a review

• 📖 Read the FMTM Contributing Guide: https://github.com/hotosm/fmtm/blob/main/CONTRIBUTING.md
• 📖 Read the HOT Code of Conduct: https://docs.hotosm.org/code-of-conduct
• 👷‍♀️ Create small PRs. In most cases, this will be possible.
• ✅ Provide tests for your changes.
• 📝 Use descriptive commit messages.
• 📗 Update any related documentation and include any relevant screenshots.

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