feat: migrate workbench to React

.trellis/spec/frontend/quality-guidelines.md

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+# Quality Guidelines
+
+> Code quality standards for frontend development.
+
+---
+
+## Overview
+
+The workbench frontend uses Prettier as the source formatting authority. Code is formatted before review; formatting is not left to individual editor settings.
+
+---
+
+## Forbidden Patterns
+
+- Do not commit dense, manually minified, or single-line JSX/TypeScript.
+- Do not hand-format around Prettier output.
+
+---
+
+## Required Patterns
+
+- Run `npm run format` after editing frontend files.
+- Run `npm run format:check` in the validation gate.
+- Keep React components, hooks, types, and API clients in separately formatted modules once a component becomes non-trivial.
+
+---
+
+## Testing Requirements
+
+- Run `npm run format:check`, `npm run test:client`, and `npm run build` for frontend changes.
+
+---
+
+## Code Review Checklist
+
+- Formatting check passes.
+- UI behavior changes do not rebuild the OpenLayers map unless the map lifecycle explicitly requires it.