Tauri desktop shell (reuses web/ frontend, connects to OpenAI-compatible endpoint, isolated in desktop/) (#24)

* Add Tauri desktop shell

* Update desktop setup after web UI merge

* Declare desktop bundle icons

desktop/README.md

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+# colibrì desktop
+
+Tauri v2 shell for the shared React interface in `../web`.
+
+This directory intentionally contains no second frontend. During development,
+Tauri starts the Vite server from `web/`; release builds package `web/dist`.
+
+## Development
+
+The shared web UI landed in PR #23 and is already part of `main`. From the
+repository root, install its dependencies and start the desktop shell:
+
+```sh
+cd web
+npm ci
+cd ../desktop
+cargo install tauri-cli --version "^2.0.0" --locked
+cargo tauri dev
+```
+
+The application connects to an OpenAI-compatible server configured in the UI.
+Bundling the inference engine or managing its process is intentionally deferred:
+the model is hundreds of gigabytes and must remain an external, user-selected
+resource rather than an opaque application sidecar.
+
+This first desktop increment only packages the existing UI in a native window.
+It does not change the web application, start the inference engine, download
+models, or add native filesystem and process permissions.
+
+## Validation
+
+```sh
+cargo fmt --manifest-path src-tauri/Cargo.toml --check
+cargo check --manifest-path src-tauri/Cargo.toml
+```

desktop/src-tauri/Cargo.toml

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+[package]
+name = "colibri-desktop"
+version = "0.1.0"
+description = "Native desktop shell for the colibri inference engine"
+authors = ["colibri contributors"]
+edition = "2024"
+rust-version = "1.85"
+
+[lib]
+name = "colibri_desktop_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2.6.3", features = [] }
+
+[dependencies]
+tauri = { version = "2.11.5", features = [] }

desktop/src-tauri/build.rs

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+fn main() {
+    tauri_build::build()
+}

desktop/src-tauri/capabilities/default.json

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+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "Default capability for the main colibri window",
+  "windows": ["main"],
+  "permissions": ["core:default"]
+}

desktop/src-tauri/src/lib.rs

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+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+    tauri::Builder::default()
+        .run(tauri::generate_context!())
+        .expect("failed to run the colibri desktop application");
+}

desktop/src-tauri/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+fn main() {
+    colibri_desktop_lib::run();
+}

desktop/src-tauri/tauri.conf.json

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+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "colibrì",
+  "version": "0.1.0",
+  "identifier": "org.colibri.desktop",
+  "build": {
+    "beforeDevCommand": "npm --prefix ../web run dev",
+    "devUrl": "http://localhost:5173",
+    "beforeBuildCommand": "npm --prefix ../web run build",
+    "frontendDist": "../../web/dist"
+  },
+  "app": {
+    "windows": [
+      {
+        "label": "main",
+        "title": "colibrì",
+        "width": 1280,
+        "height": 820,
+        "minWidth": 860,
+        "minHeight": 600,
+        "center": true,
+        "resizable": true
+      }
+    ],
+    "security": {
+      "csp": "default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' asset: http://asset.localhost; connect-src 'self' ipc: http://ipc.localhost http://127.0.0.1:* http://localhost:*"
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": "all",
+    "category": "DeveloperTool",
+    "shortDescription": "Local interface for the colibri inference engine",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ]
+  }
+}