Route browser workspaces by path hash

[GordonBeeming]

Summary

• The local HTTP server only ever held one shared workspace root, so opening the IDE in a browser always showed whichever window launched first. It now receives the per-window session registry and resolves a /{hash}/ URL prefix (a stable hash of the workspace folder path) to the matching open workspace.
• A pre-routing middleware strips the prefix and scopes the request to that workspace; without a prefix, requests fall back to the shared root, so the dev server, /mcp, and Codex paths are unchanged.
• A bare / now lists the open workspaces (single workspace redirects straight in), backed by a new /api/workspaces endpoint. The hosted frontend prepends its hash to every API call.

Notes

• The native app is untouched, since it talks over Tauri IPC rather than HTTP.
• Router::layer runs after routing in axum, so the URI-rewriting resolver wraps the whole router from the outside to run before route matching. The in-process router test is what caught this.

Test plan

• cargo test — 134 passing, including a full-router integration test that drives /{hash}/api/..., /{hash}/, and / through the real axum stack
• npm test — 275 passing, with a workspacePathPrefix case
• cargo clippy clean, npm run build succeeds
• Manual: open two folders as two windows, confirm each /{hash}/ shows its own tree in a browser

[Copilot]

Pull request overview

This PR updates the local HTTP server + hosted frontend so browser-served IDE sessions are routed to the correct open workspace using a stable /{hash}/ URL prefix derived from the workspace root path (fixing the prior “first window wins” behavior).

Changes:

• Frontend: prepend the current /{hash} prefix to hosted API calls so requests stay scoped to the correct workspace.
• Backend: add a pre-routing Axum middleware that resolves /{hash}/... to an open workspace session, strips the prefix, and injects the resolved workspace into request extensions.
• Backend: add a /api/workspaces endpoint and a bare / chooser page (with redirect when only one workspace is open).

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/tauri.ts	Adds workspacePathPrefix() and uses it to scope hosted HTTP API calls under /{hash}/.
src/tauri.test.ts	Adds unit tests covering workspacePathPrefix() behavior for dev vs hosted routing.
src-tauri/src/lib.rs	Exposes per-window session state for routing and adds workspace_root_hash() + tests.
src-tauri/src/http_server.rs	Implements hash-based workspace resolver middleware, chooser UI, and /api/workspaces; updates handlers to use resolved workspace context.
src-tauri/Cargo.toml	Adds tower dependency (util feature) for service helpers in routing/tests.
src-tauri/Cargo.lock	Locks in tower dependency.

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[gemini-code-assist]

Code Review

This pull request introduces multi-workspace support to the HTTP server by adding a middleware that resolves and rewrites requests prefixed with a workspace hash to their corresponding workspace session. It also adds a workspace chooser landing page and updates the frontend to include the workspace path prefix in API calls. The review feedback focuses on performance optimizations on the hot path of HTTP requests, specifically recommending the removal of synchronous blocking filesystem I/O in workspace_root_hash and refactoring split_workspace_prefix to return string slices instead of allocating new Strings, along with the necessary updates to the middleware and unit tests.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.