Add Tauri v2 + Svelte 5 desktop UI for helixsh

.github/workflows/tauri-build.yml

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+name: Build helixsh UI (Tauri)
+
+on:
+  push:
+    branches: [main, "claude/tauri-ui"]
+    paths: ["ui/**"]
+  pull_request:
+    paths: ["ui/**"]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libwebkit2gtk-4.1-dev \
+            libappindicator3-dev \
+            librsvg2-dev \
+            patchelf \
+            libgtk-3-dev \
+            libgdk-pixbuf-2.0-dev \
+            xdg-dbus-proxy
+
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Rust cache
+        uses: swatinem/rust-cache@v2
+        with:
+          workspaces: "./ui/src-tauri -> target"
+
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: ui/package-lock.json
+
+      - name: Install npm dependencies
+        working-directory: ui
+        run: npm ci
+
+      - name: Build Svelte frontend
+        working-directory: ui
+        run: npm run build
+
+      - name: Cargo check (Rust backend)
+        working-directory: ui/src-tauri
+        run: cargo check
+
+      - name: Build Tauri app
+        working-directory: ui
+        run: npx tauri build --no-bundle
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: helixsh-linux
+          path: ui/src-tauri/target/release/helixsh-ui
+
+  build-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Rust cache
+        uses: swatinem/rust-cache@v2
+        with:
+          workspaces: "./ui/src-tauri -> target"
+
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: ui/package-lock.json
+
+      - name: Install npm dependencies
+        working-directory: ui
+        run: npm ci
+
+      - name: Build Svelte frontend
+        working-directory: ui
+        run: npm run build
+
+      - name: Build Tauri app
+        working-directory: ui
+        run: npx tauri build --no-bundle
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: helixsh-macos
+          path: ui/src-tauri/target/release/helixsh-ui
+
+  build-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Rust cache
+        uses: swatinem/rust-cache@v2
+        with:
+          workspaces: "./ui/src-tauri -> target"
+
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: ui/package-lock.json
+
+      - name: Install npm dependencies
+        working-directory: ui
+        run: npm ci
+
+      - name: Build Svelte frontend
+        working-directory: ui
+        run: npm run build
+
+      - name: Build Tauri app
+        working-directory: ui
+        run: npx tauri build --no-bundle
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: helixsh-windows
+          path: ui/src-tauri/target/release/helixsh-ui.exe

ui/.gitignore

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+node_modules/
+dist/
+src-tauri/target/

ui/.npmrc

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+legacy-peer-deps=true

ui/README.md

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+# helixsh UI
+
+Tauri v2 + Svelte 5 desktop app for helixsh — a Warp-inspired bioinformatics shell.
+
+## Architecture
+
+```
+ui/
+├── src/                    # Svelte 5 frontend
+│   ├── App.svelte          # Root layout (titlebar + sidebar + main + statusbar)
+│   ├── store.js            # Svelte stores (blocks, role, strictMode, …)
+│   ├── app.css             # Global design tokens (CSS variables)
+│   └── components/
+│       ├── TitleBar.svelte     # Custom frameless titlebar with traffic-light buttons
+│       ├── Sidebar.svelte      # Tool status / pipeline list / RBAC role selector
+│       ├── MainArea.svelte     # Scrollable command block list + welcome screen
+│       ├── CommandBar.svelte   # Input bar with autocomplete, intent mode, history
+│       ├── CommandBlock.svelte # Per-command output block (collapsible, streaming)
+│       └── StatusBar.svelte    # RBAC role / strict mode / helixsh path indicator
+└── src-tauri/              # Rust backend
+    ├── src/lib.rs           # Tauri commands: run_helixsh, query_helixsh, window controls
+    ├── src/main.rs          # Entry point
+    ├── Cargo.toml
+    ├── tauri.conf.json      # Window config (frameless, 1280×800, min 900×600)
+    └── capabilities/
+        └── default.json     # Tauri v2 capability grants
+```
+
+## UI Features
+
+| Feature | Description |
+|---|---|
+| **Command blocks** | Each command gets a collapsible block with streaming stdout/stderr (Warp-style) |
+| **Intent mode** | Toggle `⚡` to send natural language → `helixsh intent "…"` |
+| **Autocomplete** | Tab-complete from all 50+ helixsh commands |
+| **Command history** | Arrow keys cycle through history |
+| **RBAC indicator** | Role selector in sidebar and status bar |
+| **Strict mode** | Lock icon in command bar appends `--strict` to every invocation |
+| **Doctor panel** | Sidebar shows live tool version checks from `helixsh doctor` |
+| **Pipeline list** | Sidebar lists all nf-core pipelines from `helixsh nf-list` |
+| **Frameless window** | Custom titlebar with drag + macOS-style traffic-light buttons |
+| **Sidecar support** | Auto-detects bundled `helixsh.pyz`, `helixsh` on PATH, or `python -m helixsh` |
+
+## Development Requirements
+
+### Linux (Ubuntu/Debian)
+
+```bash
+sudo apt-get install -y \
+  libwebkit2gtk-4.1-dev \
+  libappindicator3-dev \
+  librsvg2-dev \
+  patchelf \
+  libgtk-3-dev \
+  libgdk-pixbuf-2.0-dev \
+  xdg-dbus-proxy
+```
+
+### macOS
+
+```bash
+# No extra system deps — WebKit is provided by the OS
+xcode-select --install
+```
+
+### Windows
+
+```
+# No extra system deps — WebView2 is built into Windows 11 / available via installer
+```
+
+### All platforms
+
+- **Rust** 1.80+ — [rustup.rs](https://rustup.rs)
+- **Node.js** 20+ — [nodejs.org](https://nodejs.org)
+
+## Running in Development
+
+```bash
+cd ui
+npm install
+npm run tauri dev
+```
+
+This starts the Vite dev server with HMR and opens the Tauri window.
+
+## Building for Production
+
+```bash
+cd ui
+npm install
+npm run tauri build
+```
+
+Binaries and installers are written to `src-tauri/target/release/bundle/`.
+
+## Connecting to helixsh
+
+The app auto-resolves the helixsh backend in this order:
+
+1. `helixsh.pyz` sidecar bundled next to the Tauri binary
+2. `helixsh` on `$PATH`
+3. `python3 -m helixsh` (module invocation)
+
+To bundle `helixsh.pyz` as a sidecar, build it first:
+
+```bash
+# From repo root
+./scripts/package_local.sh
+# Then copy dist/helixsh.pyz to ui/src-tauri/binaries/helixsh.pyz
+```

ui/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/helix.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>helixsh</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.js"></script>
+  </body>
+</html>