Better development instructions for the Admin UI.

ui/admin/README.md

@@ -1,17 +1,39 @@
 # TrailBase Admin Dashboard UI
 
-## Codegen proto code
+This directory contains TrailBase's admin dashboard UI. It is an SPA, i.e. it's
+static content embedded into the TrailBase binary that executes in the browser
+using TrailBase's privileged admin APIs.
 
-We're using https://github.com/stephenh/ts-proto#usage for typescript generation.
+For development one case use the vite dev-server with hot module reload. First
+start the TrailBase binary in dev mode (permissive CORS and cookie policies):
 
-    $ pnpm run proto
+```bash
+$ cargo run -- --data-dir client/testfixture  run --dev
+```
 
-Make sure to install:
+and then vite:
 
- * protobuf-compiler, for protoc
- * libprotobuf-dev, for meta files such as descriptor.proto.
+```bash
+$ pnpm run dev
+```
 
-## Codegen Rust-TypeScript bindings
+## Protobuf codegen
 
-They are currently created on `cargo test` and copied to `/bindings` on `cargo
-build` where they're being picked up.
+We're using [ts-proto](https://github.com/stephenh/ts-proto#usage) for
+protobuf code generation. Run
+
+```bash
+$ pnpm run proto
+```
+
+, which requires the following system dependencies:
+
+ * **protoc**,  e.g. via the `protobuf-compiler` Debian/Ubuntu package
+ * **descriptor.proto**, e.g. via the `libprotobuf-dev` Debian/Ubuntu package.
+
+## Rust-TypeScript codegen
+
+The TypeScript bindings for the admin APIs are checked into the repository
+under `/trailbase-core/bindings`. They're generated via `ts-rs` and written
+every time the Rust tests execute, i.e. `cargo test`. They're checked in only
+to avoid having Rust depend on TypesScript and TypeScript depend on Rust tests.