feat: add dev.sh script and document keyboard shortcuts

Single script to start both backend and frontend with prefixed logs.
Updated README with dev.sh usage and keyboard shortcut reference.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dev-dashboard/README.md

@@ -30,8 +30,7 @@ docker build -f Dockerfile.sandbox -t windmill-sandbox .
 cd dev-dashboard/frontend && bun install && cd ..
 
 # 5. Start the dashboard
-cd backend  && bun run dev &   # API on :5111
-cd frontend && bun run dev &   # UI  on :5112
+./dev.sh                       # API on :5111, UI on :5112
 
 # 6. Open http://localhost:5112
 ```
@@ -119,7 +118,15 @@ The repo-level `.workmux.yaml` at the Windmill root configures how worktrees are
 
 ## Running
 
-Start both backend and frontend (from the `dev-dashboard/` directory):
+From the `dev-dashboard/` directory:
+
+```bash
+./dev.sh
+```
+
+This starts both backend and frontend, with logs prefixed `[BE]` / `[FE]`. `Ctrl+C` stops both.
+
+You can also start them separately:
 
 ```bash
 # Terminal 1: backend (auto-reloads on save)
@@ -131,6 +138,14 @@ cd frontend && bun run dev
 
 Open http://localhost:5112 in your browser.
 
+### Keyboard shortcuts
+
+| Shortcut | Action |
+|----------|--------|
+| `Cmd+Up/Down` | Navigate between worktrees |
+| `Cmd+K` | Create new worktree |
+| `Cmd+D` | Remove selected worktree |
+
 ### Environment variables
 
 | Variable | Default | Description |

dev-dashboard/dev.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "$0")"
+
+cleanup() {
+  kill $BE_PID $FE_PID 2>/dev/null || true
+}
+trap cleanup EXIT
+
+# Backend (bun --watch)
+cd backend
+bun run dev 2>&1 | sed 's/^/[BE] /' &
+BE_PID=$!
+cd ..
+
+# Frontend (vite dev)
+cd frontend
+bun run dev 2>&1 | sed 's/^/[FE] /' &
+FE_PID=$!
+cd ..
+
+wait